[STRUCTURE]     The orientation of the model is oblique. How to align the co-ordinate along the model?

A: midas Gen enables the user to set up the User Coordinate System (UCS). This local coordinate system is conveniently selected to simplify the process of geometry generation.

Most structures in practice are composed of a combination of many different plane frames and modules of similar geometric characteristics. Each plane frame and modular unit can be singled out in a given coordinate system apart from the Global Coordinate System.
From the main menu go to Structure > UCS/Plan > UCS by UCS