Is there any way I can do two "if value goes above "___", then go to page "___"?
On the same variable? I don't think so. You could use two variables and just add to both of them all the time, though.
I can't help you here, but this should be in the Writing Workshop.
(Adavced Editor forum, actually)
IF %VALUE > 100 THEN $DEST := @P200
Move to Advance Editor Forums.