Barbara learned, and taught me, how to convert PowerPoint to Visio:
- Open *ppt file
- Edit > select all
- Edit > copy
- Open blank visio file
- Edit > paste
- Stretch diagram to fit page, if needed
- Edit > Select all (one big blob selected)
- From Visio toolbar: Shape > Grouping > Ungroup
TA DA! All the little boxes and text are separate units to be manipulated as I wish.