Group sms message

Hi, I hope this has not been asked before but could not find an answer anywhere.

Just registered to Textanywhere system as it seems better and cheaper than the one we used to have.

Anyway my query is this: is there a way to send a SMS to a group of people rather than one at a time? We often just send a text when we are running offers as it seems to get the best return. But we need to be able to do that for the best part of our database in order to be worth it (otherwise too time consuming).
Thanks