wichie13, there are 4 greeting tables on that old 385 StarTalk. The issue of using a table for a separate business is that the operator station is shared by both. You could however use 'answer dn' keys for the operator on another set and name the lines for identification.
HOWEVER, I agree with norstargirl, upgrade the entire system if at all possible. The 385 may just crash under the load! ;-)
Good luck!
DueE