Window placement when the wall does not touch the floor level

Hello,

I need help with placing a window in a wall that doesn't touch the floor level.

All the pink figure in the following picture is one room obtained by merging several rooms from different levels.

When level 1 is active, the window probably is not placed because the wall originally comes from level 2.

When level 2 is active, the window probably is not placed because the chosen room is from different level (1). 

Tried all possible still heights. 

How can I place it in this situation?

Thank you,

Rotari Dan

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