Can DimXpert dimensions be added to assemblies or are they limited to parts

SP 2016-05-25

Trying to add DimXpert annotations in order to use TolAnalyst however, I'm stuck on trying to add a dimension related to a sub-assembly. DimXpert menu options appear to be greyed out in assembly. Is it possible to add DimXpert annotations to assemblies? Using SW 2015. Thanks.

Solidworks Drawings And Detailing