using a delphi unit directly in script

BIZ TMS Scripter
2

Yes, you should register in scripter the classes from that unit you want to use from the script, using one of the many registration methods as described here:

https://doc.tmssoftware.com/biz/scripter/guide/scripter.html#accessing-delphi-objects

Probably the easiest and most straightforward way is to register the classes using RTTI.

For example:

Scripter.DefineClassByRTTI(TElements);
Scripter.DefineClassByRTTI(TOuvrages);