Since the "mother ship" LLC (SMLLC) is the single member owner of each of the 10 dental offices, none of the individual LLC dental offices files a tax return.  All of the activity from all 10 offices rolls up to the mother ship and is consolidated on the SMLLC tax return.  Each of the 10 dental offices is shown as a "class" in QuickBooks, but the totals column is the amount I use for the SMLLC tax return.

However, I want to track fixed and intangible assets, by office, on the depreciation schedule in case the partners in the SMLLC sell the practice (the assets) of one of the offices, not only for "bulk sale" purposes, but also it's just easier, visually, to make sure I have disposed of all the correct assets.