Apologies about the long title of this thread.

My issues is this,

I have a shared workbook, that has multiple users, each user has his or her own sections to input data into except in one sheet, where users are expected to copy and paste from their own sections into this sheet, my problem is how can I restrict access to a user from inputting into a cell when somebody else is in the process of inputting into the same cell but has not yet saved?

Any help would be appreciated.