Simsol automatically accounts for the fact closets rarely have crown moulding or other line items that would use the upper perimeter value.
For example if you were to add in a closet, Simsol will automatically increase the floor, wall, lower perimeter, and ceiling, but will leave the upper perimeter alone. If you need to get around this (i.e. your insured has crown moulding in the closet areas), you would have to manually manipulate your data using a custom entry. To do this, find out how much the upper perimeter needs to be increased by, select 'Custom' in the Area Component Entry screen, and then manually input the difference in the appropriate field.