No problem. We do it all the time.
1st you have to change the multicall key to a key line appearance.
You do this by deleting all appearances except the 1st one. That will make it a "single line" appearance.
Next, the key you had to program the second key on, program a NEW number on it.
What we usually do is if the 1st line is 1000 we'd make line 2 to be 21000. Then line three would be 31000, 4 is 41000, etc.
Next, put these new number in a new hunt group. Number doesn't matter. Make it "terminal" hunt.
Next, go to your call rerouting first alt form and find a blank line (not #1) and make it this, this, this, this, last, last, last, last and point to the new hunt group.
Now go to call rerouting assignment form and assign this new 1st alt to the original number. If you want it to go to vm on an RNA I'll assume you can put a "2" in the 2nd alt field.
After this is done, what should happen is a call will ring to the first line. If it's busy it will go to line 2 and then line 3 etc.
Ralph