Capturable Spawn points in H4 forge?

I don’t know if this information is available, and if it is it’s been pretty well hidden, but I’m trying to create a D-Day type map and I’m having issues on spawn points. I have one team as defenders and they are confined to a rocky cliff base as the attackers move from position to position trying not to be sniped. At a few points I would like the attackers to (take over) capture spawn points. I don’t know if I need to make those secondary spawn points neutral or if there is some way I can make them capturable by the attacking team only. If anyone knows how or knows a great resource it’d be much appreciated.

Which gametype are you using? I think the only way to do this is through the Dominion gametype

(Link certain spawn points to a base capture point in Forge and then in the gametype settings make it so players only spawn at captured bases)