Are you trying to use ranges from multiple sheets for the same X or Y series?
I've never seen that done. You can use X axis ranges from one sheet and
Y axis ranges from another.

"Vic" wrote:

I am trying to use ranges from several pages in one chart. When I set the
source data to: =Sheet1!$A$2:$O$2+Sheet2!$A$3:$K$3

I get the following error: Reference is not valid

HELP, what am I doing wrong?