Methodology for Subspecies Phylogeny Inference

[Cleiton Valentim]

Hi. 

This might not be the right group, but I would like to know if it's possible to infer the age and topology of subspecies inserted within a dated phylogeny. I have the dated phylogeny of the species, but not for the subspecies. There is no molecular data at the subspecies level for this group of birds I'm studying, and the division between subspecies is based mainly on geographic distribution and a few morphological differences, such as feather coloration. I would like to insert the subspecies for the BioGeoBEARS analysis, but they would appear as polytomies, and even if I correct these polytomies, I still have methodological concerns about how to justify this decision. 

I would greatly appreciate it if anyone has any methodology to suggest.

Best,

Cleiton Valentim