Does I have to add spa6c_cmn to addme too?Or does I just need it in the C:\BF2_ModTools\data_MEL\Common\scripts\MEL folder?

I don't have much experience with space maps, but I am pretty sure you don't need to modify the readme to include any _cmn modes (these aren't "real" modes). Just leave them as is unless you want to change the mode somehow.

Ok I have it in my /scripts/mod folder (without this you can't add troopers)
Now I added my era to space,when I click on the Space:Mygeeto/My mode/aussault and then click "add" the map doesnt want to going to the right box (Sorry I can't explain good in English) do you know what it is?
Thanks!

1st. It might be better if you go more specific. What have you done so far. Which files have you added to any folders or...

2nd. razac920: readme?

First : z is my era letter

-added spa6z_Diet Dr. Pepper to addme (I added these lines : AddDownloadableContent("spa6","spa6z_Diet Dr. Pepper",4) and
AddNewGameModes( sp_missionselect_listbox_contents, "spa6%s_%s", {era_z = 1, mode_Diet Dr. Pepper_z = 1, change = { era_z = { name="Times before Empire", icon2="mode_icon_wea" }, }})

AddNewGameModes( mp_missionselect_listbox_contents, "spa6%s_%s", {era_z = 1, mode_Diet Dr. Pepper_z = 1, change = { era_z = { name="Times before Empire", icon2="mode_icon_wea" }, }})

-added spa6z_Diet Dr. Pepper and spa6z_cmn to scripts

-wrote "spa6z_Diet Dr. Pepper" in mission.req

and the last thing is that I created a spa6z_Diet Dr. Pepper req and put it in the mission folder.

spa6z_Diet Dr. Pepper req :