Adding a row or column to a Google Slides table expands its structure without rebuilding the whole table. The important choice is where the new cells belong. An extra column in the wrong position can make existing headings appear to describe the wrong values.
Select a reference cell
Open the presentation on a computer and click a cell near the intended insertion point. Read its row and column headings before opening the context menu. Use a cell that makes the desired direction unambiguous rather than clicking whichever area is easiest to reach.
Insert in the correct direction
Right-click the cell and choose Insert column left, Insert column right, Insert row above, or Insert row below. Google’s table guidance describes these commands for documents and presentation slides.
Review the new blank cells immediately. Enter the new heading and data before making further structural changes, so you can tell which part of the table has been added.
Recheck the whole comparison
Inspect headings, units, totals copied as text, and any manually formatted emphasis. Adding cells does not establish new calculations or update a separate source dataset. Check the table’s overall size and position on the canvas and adjust row or column dimensions thoughtfully if the new structure creates wrapping. Present the slide and confirm that the additional information still serves its main point. If the table has become too dense to read, split the comparison instead of allowing one small addition to make every existing cell less usable.
References
Reviewed against the linked official product guidance on November 3, 2026. Features, limits, screen labels, and access can vary by account, platform, region, and organization policy.