Modelling post trans mods

Hi All, I have just started modelling a G Protein-Coupled Receptor, which has a number of post translational modifications. My problem is that my template, Rhodopsin, is glycosylated on the extracellular loops at a different position to my target sequence. Is there a way of adding the glycosylation to my target protein either at the alignment stage or before the model in refined. As always many thanks in advance.

John.