PLEASE HELP in merging workbooks 07

[Micheleg]

I am fairly new to excel and will be using math formulas in the near future and will ask for help then. NOW my issue is is that I have A workbook 07 on my PC and and another workbook 7 on an external hard drive so that someone else can enter info into sells to be able to put external hard drive work into PC workbooks. 1st off do cells have to be formatted the exact same way, with same titles. some how some of the work has transfer but I have no idea hoe and why??? Exactly how do I get ex drive work for the day into my PC book and vice verse if I made entries in the PC book as well. NOTE: external drive started new excel 7 workbook and not with a copy of original on PC.. Please help I need this done asap so that I can invoice items I will be selling in just $ days. Thank you