When a mid-sized infrastructure client came to us with a problem — their MS Project Online licensing costs were ballooning, their team leads refused to open .mpp files, and their executives wanted real-time dashboards instead of emailed status reports — I knew a migration to Smartsheet was the right call. What I didn't know yet was exactly how many sharp edges that migration would have. This post is the honest, practitioner-level walkthrough I wish I'd had before I started.
Why Teams Move from MS Project Online to Smartsheet
MS Project Online is a powerful scheduling engine, but it was built for dedicated project managers who speak Gantt fluently. Smartsheet sits in a sweeter spot: it still gives you robust Gantt charts and dependency logic, but it layers on real-time collaboration, no-code automation, and dashboards that any stakeholder can read without a training session. For teams that live in Microsoft 365 but want something lighter on the PM side, Smartsheet also integrates cleanly with Teams, SharePoint, and Power BI.
The cost math usually seals the deal. Once you factor in Project Online Plan 3 seats for every resource who needs to view a schedule, Smartsheet's per-seat model often comes out significantly cheaper at the 20-to-50 user range where most of our clients sit.
What You're Actually Moving
Before touching a single export button, I always do a data audit. In MS Project Online, you're typically working with:
- Tasks and subtasks — the WBS hierarchy
- Finish-to-Start and other dependency types (FS, SS, FF, SF) with lag values
- Resource assignments and percentage allocations
- Baseline data — original start, finish, and work estimates
- Custom fields — status flags, cost codes, phase labels
- Project-level metadata — budget, sponsor, department tags
Smartsheet handles all of these, but not all of them survive a naive copy-paste export. Knowing that going in saves you from a painful cleanup session on the other end.
Step 1 — Export Your Project Plan to Excel
MS Project Online doesn't offer a direct Smartsheet export, so your bridge is Excel. Inside Project Online, go to File → Save As → Excel Workbook (.xlsx). When the export wizard opens, choose the fields you want to include — I always add Task Name, WBS Code, Start, Finish, Duration, Predecessors, Resource Names, % Complete, and any custom fields the client uses regularly.
One critical setting: make sure you export the Predecessors column using row ID format, not task name format. Smartsheet's import engine reads numeric predecessor IDs far more reliably than text strings, which saves you from rebuilding dependency chains by hand.
Step 2 — Clean the Excel File Before Importing
This is the step most guides skip, and it's where migrations go sideways. Here's what I clean before touching Smartsheet:
- Flatten summary-row formatting. MS Project bolds and indents summary rows visually but doesn't always encode hierarchy in a way Smartsheet's importer can read. Add an explicit indent-level column (1, 2, 3) so you can rebuild the WBS hierarchy using Smartsheet's indent controls after import.
- Normalize date formats. Confirm all dates are in a single consistent format (MM/DD/YYYY works reliably). Mixed formats — common when a file has been touched by multiple regional settings — will silently corrupt your timeline.
- Audit predecessor values. Look for any cells with lag notation like 5FS+2d. Smartsheet supports lag on dependencies, but you may need to re-enter these manually after import. Flag them now.
- Remove MS Project-specific columns that have no Smartsheet equivalent (like Leveling Delay or Peak Units). Leaving them in creates orphan columns that clutter your sheet.
Step 3 — Import Into Smartsheet
In Smartsheet, create a new sheet from the cleaned Excel file (Home → Create New → Import). During the import dialog, map your Excel columns to Smartsheet's system columns: Task Name → Row Name, Start → Start Date, Finish → End Date, % Complete → % Complete. Predecessors should map automatically if your column header matches.
After import, switch to Gantt view immediately. This is your first visual sanity check. If the bars render and the dependency arrows connect logically, you're in good shape. If you see a flat timeline with all tasks starting on the same date, your date column mapping needs fixing — go back and re-import rather than trying to repair it in-place.
Step 4 — Rebuild Hierarchy and Validate Dependencies
Now use your indent-level column to rebuild the WBS structure. Select rows at each level and use Smartsheet's Indent control to nest them under their parent summary rows. This step takes time on large projects — a 200-task plan might take 45 minutes to an hour to rebuild properly — but there's no shortcut worth taking here. Your rollup formulas, summary bars, and reporting all depend on correct hierarchy.
Once hierarchy is set, go through your flagged predecessor cells and manually re-add any lag values. Also spot-check a sample of 10-15 critical-path tasks to confirm their dependency arrows point to the right predecessors in the correct sequence.
Step 5 — Migrate Baseline Data
Smartsheet supports baselines natively under Project Settings → Set Baseline, but it captures a snapshot of current data — it can't import historical baseline values directly from Project Online. My workaround: add custom columns (Baseline Start, Baseline Finish, Baseline Duration) populated from your Excel export, and use a simple formula to calculate schedule variance. It's not identical to Project Online's baseline engine, but it gives stakeholders the variance visibility they actually care about.
Step 6 — Rebuild Reporting and Dashboards
This is where clients feel the immediate payoff. In Smartsheet, build a Report that filters by status, owner, or phase — this replaces the custom views your PMs were building in Project Online. Then create a Dashboard with a Gantt widget (pointing at your sheet), a chart widget (task status by phase), and a metric widget (% complete rollup). The whole thing takes about two hours and replaces what used to require a Project Online reporting add-in or a Power BI integration just to share a simple status view.
Common Pitfalls to Watch For
- Resource calendar differences: MS Project Online uses resource-specific calendars for scheduling. Smartsheet uses a single project calendar. Any resource who worked non-standard hours will have duration discrepancies you'll need to manually reconcile.
- Effort-driven scheduling: Project Online adjusts duration when you add resources. Smartsheet doesn't do this automatically — make sure your team understands the scheduling model has changed.
- Formula migration: Any calculated columns in Project Online need to be rebuilt as Smartsheet formulas. Document them before you start the migration.
The Result
The infrastructure client I mentioned at the top went live on Smartsheet within three weeks of starting the migration. Their weekly status meeting went from a 45-minute Excel walkthrough to a 15-minute dashboard review. Two resource managers who had never opened MS Project Online were actively updating task status by the end of week one. That's the real win — not just moving data, but moving to a tool the whole team will actually use.
If you're planning a similar migration and want a second set of eyes on your data structure before you start, reach out to the team at Helion 360. We've done this enough times to know where the bodies are buried.