Aggregate Planning Book View across Locations

Hello experts,

We have a requirement to create a SNP planning book view which can provide an aggregate view of critical Key figures for assessing the overall inventory health of a material across supply chain locations. The aggregate view should include Forecast, Inventory, Sales Orders, In transit, On hand Inventory, Total Inventory, Days of Supply. 

Some other key assumptions:

1. The selection should only be by Material and provide the aggregate view for all locations.  Drill down to other locations is not necessary in this view. 
2. The ability to make changes to production within this screen is required
3. In-transits should be considered as part of the on hand.
   1. We should have a key figure for in transit
   2. Another one for “on hand inventory”
   3. And a total inventory
   4. Days of supply should be based on the total inventory

Can you suggest how to implement a planning book setup like this which can give global visibility of critical key figures? We also have some challenges regarding the calculation of Global days of supply, global demand, global stock on hand, etc. It will be helpful if you guide on these challenges as well.

Any help is highly appreciated. Thank you.

Best Regards,

Parth Soneji