Making an alliance in game

So my friend made a guild the other day and its a branch of my guild the cyber star raiders. Its called the galactic star raiders and i wanted to make an alliance but that isnt possible in game. I really hope u can have multiple alliances and have it so u can go into other guild halls. for example when u go to the portal u have a list of guilds ur in an alliance in and u get to choose the guild hall. I was hoping you could do /a and have all the ppl in the alliance here you sorta like guild chat.