Own extension and want an own group and 'sub' entities in the tabList

[Ednt]

Hi,

I create an own extension with many entities.
I want to 'bundle' the entries in the navbar with an own group and the entities inside...

[Ednt]

Hi,

I want to build an own extension and I need to prefill 2 tables.
I thought the right place is in AfterInstall.php
I wrote...