How do i refer to a .bsa in the Creation Kit?

[hexenhaus]

I have problem regarding a .bsa file:

In order to mod an .esp file i unzipped the appropriate .bsa data and made a new .esp. The original .esp used the data from the .bsa, but mine does not (i need to extract its content). So how do i tell my esp to use a specific .bsa-file as it´s master? 

[AmyScarlet]

Just name the .BSA the same name as the .ESP

 

The ESP should do the rest.