E10 Dashboard question

I am trying to develop a KPI dashboard for Supply chain.  The dashboard contains 2 BAQs that summarizes PO activity by buyer and summary shipment transaction data by plant.  The shipment baq is much more complex than the PO summary baq has 3 sub reports that pull the 3 types of shipment activity desired - actual shipments, drop shipment receipts and misc. shipment entries.  The 2 baq's have just one thing in common - the begin date and end date parameters for the data.

Have anyone had any luck creating a Dashboard assembly that would only require the parameter data be entered one time to refresh both queries?