Split fields in two like make/model

[Marina Charalampous]

Hello guys!

I need your help!
On auto classified you can see that the make/model can be split in two First you can choose Make and after in the next option if you want you can choose model (see photo 2)

In the other fields(see photo 1) is only one to choose but i want to make it like the make/model fields.

Anybody can help me?

Thank you in advance