See List of excahnge formats of allplan:
https://help.allplan.com/Allplan/2019-0/1033/Allplan/index.htm#76832.htm

as far as i understood, UNITECNIK is used in precast sector:
https://www.unitechnik.com/betonfertigteiltechnik/unitechnik-cad-cam-interface.html

maybe you need allplan precast software (Planbar) for this format:
https://www.precast-software.com/en/solutions/planbar/

Hello,

I can confirm you that UNITECHNIK is an industrial format for precast industry containins, geometry of concrete, bars and fixture.

So if you design reinforcement bars, it's possible to create Unitechnick data only by using a planbar application.

Don't hesitate to contact us if you have other questions.

Bye