dial-peer cor custom
dial-peer cor list manager
dial-peer cor list executive
To manager ephone-dn, assign corlist manager (inbound) and to remaining ephone-dn, assign cor list executive (inbound).
Now you will have to have duplicate outbound dial-peers (two set). To first set (for manager) with voice port of manager, apply corlist manager (outbound) and to remaining dial peers with remaining 9 voice ports, apply corlist executive (outbound).
There could be other ways also to achieve this, but I could think of this now.