Hi,
I try to write a query, but, I'm not aware in your data model. I try to create table relations using your description, but I have this picture:

MEETINGS MEETPROC
meetingNumber --------- meetingNumber
ProcedureStart | procId
ProcedureEnd | procDesc
|
| COCASEDATA
------ meetingNumber
inventoryID
Qty
ItemUnitCost

This doesn't seems enought to calculate the data you need