Get/Read properties of object from COLLECTION_FIND in Agentry rules

Hi,

Is there any way to get/read a particular property of an object returned by COLLECTION_FIND,

(by using update rule)

For e.g.

I am on Workorder Detail screen,

I have a field where i am searching an operation list for particular operation id,

COLLECTION_FIND returned me an operation object,

And now i want to display that operation description by update rule....

(Right now i have written a sub rule to get the same-----Like----->Operationlist--->first object where subrule is true---->return operation description)

what i am trying to achieve is to avoid use of subrule in this