Select Datum Plane and hit Options> Save Query
This will create a datum_plane layer like the included picture.
OR if you really want to get rid of other stupid layers, open your assembly and load the included config file, then type "nlp". I call this one nuclear layer propagation!!! (for WF3)
In Reply to Doug Schaefer:
How can I use the search tool to reliably find the three default datum planes in a model, given that they may not always be the first three features and may not have the names that correspond to our company standards?
Sorry Doug, I don't believe there is a way to 100% reliably find the default datums.
Feature numbers don't work - they may have been reordered.
Feature id's won't work - they may have been created later, by suppressing everything existing first.
names - you know that one.
Hmmmm - I don't know how to test for it, but they would be datum planes that have no parents.