yes, sure!
Open both excel files, go to the destination file and tipe in the formula you want, selecting the cells from the right file (you can move between the files WHILE you're entering the formula and the name of the cell you're adding in the formula will contain the name of the file as well:
- type =
- then move to the other open excel file, select a cell and type +
- then move to another cell on another sheet or file and select it as well
- After selecting the last cell of your formula, BEFORE you go back to the original cell that contains the formula, press ENTER: excel will terminate the formula and jump back to the original cell
Be careful: if you move or rename the satellite files/sheets, the formula will fail and you'll have to pick the external cells again.
anyway the general rule is : [Filename]SheetName!Cell like this =[Book1.xlsx]Sheet1!$C$6
Ciao!