having a little trouble persisting through many vips to pool members on a specific host

I'm fairly certain there isn't a built in profile that will allow me to group members of different pools into a logical unit and allow me to persist a source IP that has used a pool member in that logical unit to only use other pool members in that same logical unit. I think this can be done with a universal profile across vips that calls an irule that can iterate through a data grouping of all pool members and determine which members belong to logical unit A, B, C. Then depending on the service they are requesting, send them to the pool member associated with the logical unit in which they are already assigned. I'm quite new to writing irules and have only written a few simple ones. If there is something similar that I can take a look at I can use that to build this rule.