Time Stamp a distant cell based on lift values

Hello,

I have two dynamic lists, one for the group name the next for the value. i.e. fruit<tomato. Now, I need to time stamp the cell that is within the row of the corresponding selected list item. I'm looking for what I can put in the code. All I know about coding time stamp buttons is " Range("D7").Value=now() " which is great for stamping 1 cell, but I want to stamp the cell withing the master file, because I need the row on top blank. If I didn't make any sense, or if I need to clarify, please let me know.

Thanks for any help, and for reading this verbose question.