There are a number of ways you could acheive this. Can you Private Message me the business number you want to keep and the full address of where you are moving too and I will review some options for you.
Hi foamymedia,
the easiest solution would be to get a Featureline with 1 auxiluary line. So you would have 1 main number but have 2 or more phones connected to the line, and able to make 2 calls at the same time. If you wanted to make say 3 or 4 calls at the same time you would add more auxiluary lines.
if you are interested in this send me a private message with your contact details and I can get the correct team to call you and to dicuss your requirements.
Markp