I would like to consolidate Order lines for the same Item into a single Picking line.
Solutions
It is not supported by Mobile WMS or Base application
You can cannot combine Pick lines per Item.
The warehouse shipment lines have a one to one relationship with the order lines and you can only ship from one bin at a time per line.
Mobile WMS
Does not add any functionality regarding Pick creation.
Pick Worksheet
The worksheet can separate Picks based on Shipment, Item, Bin etc.
But not consolidate.
Tote-picking
Mobile WMS Tote-picking will allow you to easier pick multiple Order to the same Receipient and in the process physically place the items in a Tote/Package.
But not consolidate lines.
Seek professional assistance
You need to have this conversation with a dedicated Warehouse consultant, most likely via your Business Central partner.