i have two little questions to you: How to add several subforms to a form in C# like on the pictures below:
[Cascade]
[Tile]
And the second one is how to manage their position(Cascade, Tile, etc.). Thank you for your time!
This is a Multiple Document Interface (MDI) form but, as Robert Harvey mentioned in a comment, there's probably a better way to build your UI.
To layout the child forms you will use the LayoutMdi method of the parent.