First step behind me.
I tried copying prefix_categories tables to:
prefix_categories_blog
prefix_cck_store_form_category_blog
and modify
add individual fields
It didn't work as I wished.
Where's the error?
Now I know to make thebale in mysql create itself,
Forms & Content Types -> copy eg Category and give a unique name.
Is it possible to build independent application content in Seblod on this table?
Will it work?