# What do I do if only a section of the wall is a parting wall?

If only a section of the wall is a parting wall, for instance, if there is a garage behind half the wall but not the other half, you can split the wall using the [blue handles](https://help.heatpunk.co.uk/books/plans-task/page/creating-rooms).

Simply drag and drop the blue handle to the point where the wall needs to be split.

You can then select whether the other side of this wall is a *heated* or *unheated* space. In the example, you would select one half of the wall as *unheated* space and the other as *outside*.