If I understand what you mean, you want to have key 1234 appear on 2222,3333 and 4444.
If a call hits 1234, any can answer - say 2222. What you want is key 1234 on 3333 and 4444 to still show free and both ring if another call comes to 1234.
You can't do that.
1234 can have many call appearances. A bridged appearance is specifically tied to 1 of 1234's call appearances. So, you could have 3 bridged appearances on 2222,3333,4444 each of call-appr 1 and 2 and 3 of 1234. You can have automatic exclusion so that if 2222 is on one of those keys, 3333 and 4444 can't bridge on.