Multiboards

how do i make them show up to only one player? (or one player group)

This should be in T&S. You would create the multiboard for all players, hide it for all players, and then show it if GetLocalPlayer == YourPlayer (or IsPlayerInForce(GetLocalPlayer(),YourForce)).

i am not familiar with jass. is it possible to make it via triggers?

Not with GUI, you'll need JASS for such an action.
I'll explain you what
if GetLocalPlayer() == <Your Player> then
does.
This condition make it possible to make only 1 action for a specific player, so you can show 1 multiboard to only 1 player, but you have to be careful with this condition because it can cause desync with several actions, like creating 1 unit using GetLocalPlayer() because the other Players won't see it.

yeah but i have no idea what to do..i am not familiar with jass at all.

don't have my WE opened atm, but i'll to post you the part you need.

okay...lets say i want to show the multiboard to all allies of playing 1 (red). what do i replace TriggerPlayer with?

Uhm, not sure if this will work, due i don't use GetLocalPlayer() that often.

thanks. it worked.

Moved.