Add Spaces
Navigate to the Property list
Use the 3 dots
Click Layout(GLA)
Right click the (GLA) at the top of the list
Select the Type of space you want to add.
When the create modal appears you can give the space a name, this name should be for the unit, do not name it after a tenant because tenants will change and this can be confusing.
The unallocated SF is for reference only, this could be Risers, Closets or any SF that is part of the space, but should not be used to compute a SF cost for the tenant.