how do I make a spreadsheet with 31 pages of the same layout to be filled in later

edit

kiss: there is a function 'move or copy sheet' when you right-click on a sheet tab at the bottom of the screen, just define and layout one sheet, then use 'copy', and then change what's needed individually on the sheets,

ok?

I would suggest, you create 1 Dolument with 2 sheets,

The 1st sheet holding the Layout+Style with placeholders (aka. marked insert points) The 2nd sheet holding the variable/insertable data together with an action switch to insert/autofill said data into the 1st sheet (on demand).

• If you need more detailed instruction, just ask in the comments.

Hope that helps.