Configuration for merge manufacturing orders, here you can choose merge type and if you tick the "Notify in Chatter" option then it gives notification of merged orders into the chatter.

"Merge MRP Orders" menu and tree view.

Merge manufacturing orders wizard with the default selected merge type.

You can merge only draft/ confirmed/ in-progress state orders.

You can merge MRP orders which have the same product/bill of materials.

Merge manufacturing orders wizard with the existing order type, The production lines are show when subtract merge quantity is set to true in setting.

Here it creates a new order and cancels selected orders.

The merged MRP order form view.

Merged orders notification comes into the chatter.

Enable "Subtract Merged Quantity".

Select two or more order and click merge MRP orders.

So it opens merge MRP order wizard with all records quantity. You can subtract qty from this wizard as well.

Created order list view.

New generated Merged MRP order looks like below.

If you try to add qty more than order line qty then alert occurs.