Isolating Top Level Parent in a Boolean


I am having an issue that I'm not sure is able to be solved, but wanted to ask the community to see.

I have a hierarchy as follows:

Top Level = Total Company

BU L1 parent = Total Company

BU L2 parent = BU L1


In a boolean line item dimensioned by BU L2, I've tried a million ways to try and get the "Total Company" box to have a TRUE and the rest be FALSE. I can't use a lookup with a formula summary method, and not seeing a way around to accomplish the goal. I can have the Total Company appear TRUE while the BU L1 children are false when the line item is dimensioned by BU L1, but I cannot figure out a way to draw this down to the BU L2 level. Any ideas? 

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