Using variable for IPs in Visio?

I'm not having the best of luck with my google-fu so i'm hoping someone here may have figured this out already.

I'm trying to create Visio documents for all our offices and I've broken out the IP schema so it's identical everywhere, just the first couple octets change.

Is there a way I can populate variable fields on one Visio page and have it update those variables elsewhere in the Visio?

Up to now i've been doing a search\replace on the /24 i have all my routed /29, /30s in; X.Y.Z+1 for example. I'd like to be able to populate that using a variable like $RoutingSubnet.