Bunkers, foxholes, mines, barbwire etc.

[Gladiator]

Hello,

I have some difficulties in finding the deployment of bunkers, foxholes, sandbags etc. in building a scenario.
Where can i find these ? (Infantry, Misc.??)

Also i wanna place barbwire and mines but every time i don't have buildpoints. Where can i find these buildpoints ?

More than once i have read the manual but no, i can't find.
Could somebody please give me some help ?
Thanks in advance !