if the creature 1 inherits after creature 2 and creature 2 inherits after creature 3 does creature 1 inherits after creature 3 ? in other words : if creatrue 3 has script "A" and creature 1 has script "C" and creature 2 script "B" and 1 hase 2 as template data and 2 has 3 as template data so do creatrues on has all script "A"B"C" or just "B" or just "C" . is it requier to check "Use script" in template data to inherits script from tamplate actor base ? how to add more than one script to creature ?

Unfortunately you cannot have more than one script on a creature. The script is from the top of the inheritance stack.

Exactly. And if Creature 2 is inheriting EVERYTHING from C3, then you could not place a script on it. You can only place a script on 2 if it doesnt inherit the script. Thus giving 1, 2's script B. Same thing with lower, 1 cannot have a script if it's set to inherit from 2.