Trying to figure out whether it's possible...

I'm using 2 degrees business plan that comes included with a landline number, which I use a lot. The mobile number was originally by Vodafone and start with 021. Not many people know this number

I also have another phone number with Skinny, starts with 020. I had been using this number for my business before and now want to swap the numbers, so that all business calls go to 2 degrees.

So, basically, have 020 and landline on 2 degrees, and 021 reserve for personal calls. 

Is it possible?