@Anonymous_ not sure if this would work. So "check me" on this.
Lets say you have three rental properties you want to aggregate.
Basically, you enter all three as a single property, listing each property separately in the Assets/Depreciation section. This would mean the totals for all properties listed would be under Column A of the SCH E. Of course, this also means one can't realize any suspended losses on any of the properties until all properties under this single column are sold.
I am not sure it makes a great deal of difference since a statement that the taxpayer is making the election pursuant to Section 469(c)(7)(A) needs to be filed (in accordance with Section 1.469-9(g)(3)). As a result, a TurboTax user is left with no choice other than to draft that statement and print and mail the return.