Hello! I don't have that phone. We do have some forums of the Huawei brand you could check out, but we do not have a forum for the Fusion.
Generally speaking though, in the People app, you should be given an option to edit your contacts.
When I look on my device, under phone number, I see a + sign that I can press and it offers up a place for another number. I can tap on the category, like work or home or mobile, and it lets me choose the one I want.
I hope that helps!