A munfacturing order can only have one source location / omponent location.  You find the setting in the Miscellaneous tab in manufcaturing order, and it is set in the Operation (Inventory->Settings->Operation types).

So you would have to do a picking of the components before you can manufacture.  You can set up a "Pull From" rule that create the an internal transfer for picking. It can even be set to be confirmed automatic.  It should confirm the total qty you need for the components missing in manufacturing

But - why do you have this Semi finsihed location?  Is this really a physical location or just a functional?   Locations should always be physcial, and tell you where to go to find your stuff.  Only. Then you need a picking to go and get them to manufacturing location.

Make a drawing of the shop floor / warehouse and draw lines between the location.  If your components and semifinished are within the same "lines" on your drawing, skip the semi finished location.