Have a look at Lee-mac "page X of Y" does just that for title blocks.
You can make a field that uses taborder for sheet number and count for the total of layouts., I would use these in attributes of a title block where I worked it had 25 attributes. Trying to find a shorter version. Had something the COUNT did not work in Bricscad V24.
Just a second comment look here for DWGINDEX.lsp does just that makes a index of your layouts based on title block Tag names.
InsertSheetofSheets.lsp
Dwgindex.lsp