Fastest method to match 2 blocks (dependent on matching attribute) in a drawing.

[Anonymous]

I am trying to make window elevations(dynamic block) from windows in plan(dynamic block). both have dynamic properties. Attribute of elevation block is linked to window in plan through field. As First step I can create all elevations. but I want all elevations to be updated whenever window is changed(based on dynamic property), if attribute are same.

When it comes to updatation,  What I have done is made selection set of both windows and elevations. First I update field of both then then I iterate through selection sets to match attributes and change dynamic property of elevation block as per window sizes. Problem is For around 50 windows it takes a lot of time.

Is there anyway to do this faster? I have come across xdata. Can i assign xdata to each block and have same unique number(integer value) to match? or there is any better method?

Regards...