An indoor room is to be modelled which is divided up into two offices and a corridor by means of partition walls. 

The offices are to be accessible from the corridor through an opening. 

One of the offices is additionally to have a hatch between the office and the corridor for serving customers.

Example of cut-outs in a partition wall.

Model the partition wall and the cut-outs in the wall in the form of partitions and cuboids.

Create the Boolean difference between the partition wall and the cut-outs in the wall.

In this YouTube tutorial, you can see further examples of cutouts by using the Boolean group function.