Is there anyway to target multiple versions of a single package when making assignments? I know I can "update" an app volume to capture a newer version, but is there anyway to make an assignment to an older version of that same package?

Basically, I have like 40 different versions of the same application that developers need to access and it'd use a lot less disk space to hold them all in a single app volume and capture the minor differences between them instead of creating 40 separate app volumes. I don't see a way to target an old version of an app volume when making assignments though. 

Thanks!

Gary Dawkins