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So removing "g" would then only replace the first occurrence.

Maybe you should reverse your initial matrix : ....


$cat my
var_Site,SITE-A1,SITE-A2,SITE-A3,SITE-B1,SITE-B2,SITE-C2,SITE-C3,SITE-C4...

Where is the $var_Host info to be found?

--- Post updated at 17:39 ---

Assuming / inferring you mixed up var_Host and var_Name, how far would this:

awk -F, '
{sub (/var_/, "", $1)
...

Do you want to remove the last dot as well?

sed 's \.[^.]*$ ' infile