A family of Microsoft word processing software products for creating web, email, and print documents.
There's no indication of what specific attempts you've made or what "can't quite get there" is intended to convey so if this is redundant please forgive me but it works here provided the document is as simple as you suggest:
- Go to Edit> Find> Advanced Find and Replace
- Click the Replace button
- If necessary click the expander button [🔽] in the lower left corner of the dialog window
- Type ^# in the Find What field
- Click the Format button at the bottom of the pane
- Select Font
- Tick the box for Superscript
- Click OK
- In the Replace With field press the <space bar> once then type ^&
- Apply Superscript as described in the 4 steps above
- Either Replace All or Replace on a 1-by-1 basis if you prefer
Don't forget to use the No Formatting button on both fields when you're done. It will remain in effect unless you do so may interfere with future use of Find & Replace if you don't notice that it's active.