my favourite maps: 1 and,7
Edited 2.66 days after the original posting.

Thanks!

@I_like_quake: No (but technically yes), the pk3 is a 'single' grouping of all the files needed.

However, you could extract all the files required for the map(s) you want and make your own pk3, but it is a fair amount of work.

An easier option would be to remove the scripts/<map name>.arena file from the pk3 for the maps you don't want in the pack. This will prevent the unwanted maps from appearing in the in-game menu system, but you could still load them from the console if you really wanted to.

Does anyone know if i can just pick out certain maps and put it in my baseq3 folder or is that not possible?

I cannot play it in Threewave by menu (seem it's broken), for the play I have to use console...