Get number in cell add to it and put back in same cell

Giganews Newsgroups
Subject: Get number in cell add to it and put back in same cell
Posted by:  Dave
Date: Wed, 4 Mar 2009

I have files that I need to insert or delete x number of lines from. When I
do I need to fix index values in the file that are values in a certain
column. for example
Cell F10 has a 8
F11 has a 9
F12 has a 20
F13 has a 15

If I insert 5 lines between line 11 and 12 I need to add 5 to F12 and F13 etc.
There might be a way to do this but i'm unsure.
Thanks,

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