Remove a surface from another one from a 2d dgn file

Hi guys, I am currently working with microstation connect and windows 10.1 pro. I need your advice for something that I would like to do and I don t know yet how to do it.

basically I am working on a 2d dgn, and I have 2 issues

1st : I have a square surface from which I would like to remove another surface in this example a circle but it is gonna be a polygone surface in my project.

2nd: I need to split this surface so the square minus the circle into 8 "sub" surfaces in order to create a gml of less than 15sq meters which is necessary for a side app which need a surface of less than 15sq to work.

If you guys have ideas and willing to share these, I am all ears.

thanks anyways.

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