Are Synthetic Time Series able to reference other Synthetic Time Series in their formulas specified?

This is the problem I am trying to solve:

- Synthetic Time Series is limited to referencing 100 time series
- Sometimes a unit/facility/system/functional location/site may have more than 100 direct child assets
- I need to calculate a “Synthetic Time Series” that is the daily average of a time series found on all child assets

My thought is that, for 300 assets, I would have:

- STS A: Sum for assets 1-100
- STS B: Sum for assets 101-200
- STS C: Sum for assets 201-300
- STS Sum of STS A, B, and C divided by 300

Is there a better way to accomplish something like this in CDF?