Refresh or initialize data display from more than one Entities

Support
#1

Hi
I have following entities:
1-2 > PurchaseOrder and PurchaseOrderLines
3-4 >PurchaseOrderQualityMgtTracking and PurchaseOrderQualityMgtTrackingLine
5 > PurchaseOrderQualityMgtTrackingSteps

The entity # 5 contains different steps of tracking the purchase order.
The Entity # 3-4 are used to maintain the status of different tracking points defined by the user based in Entity # 5 on the material in the PurchaseOrderLines entity.

What I need is to display all PurchaseOrders for the selected Vendor with respective steps populated in the browser. Then will edit the status of each step.

#2

You can display several entities on one screen by creating several datasources and linking visual components (e.g. Tables) to them. The datasources can be interconnected (see https://doc.cuba-platform.com/manual-6.0/datasource_query_params.html).
Can you provide a sketch of the required screen?