Connect mesh of design and non-design space

Hi all,

I'm doing a topology optimization to wheel spokes and my model consists of a big disk with the contour and the area where the lug nuts apply (image attached). As I only want to optimize the spokes the green area must be the design space. I can connect it with the purple area but i cant connect it with the yellow one. The contour geometry (yellow part) is also attached.

I tried to import the model from solidworks as a single part and cant split in hypermesh the spokes from the contour. I have also imported as 2 sepparate parts and when meshing problems appear and can't mesh it properly.

Regards,

Rodrigo