Problem with importing

So i probably im stupid but if i try to import a focus tree (for my example polish focus tree and i have the nsb dlc) when in localisation i choose the poland_dlc_focus_l_english.yml file only the vanilla part of the tree is visible and the rest is undefined, and when i choose the nsb_focus_l_english.yml file only the dlc part of the tree gets imported and the rest is undefined. if someone could help me it would be nice (sorry for my mid english)