Reference Material for Packaging - Weight vs. Quantity

I understand how to create a Packing Instruction with a Reference Material. Like the example in SAP "4711    100 pc."

My question is, with "Mixed Materials Allowed" how do I look at weight instead of quantity?

So to expand the example, let's say I have a Packing Instruction with a Reference Material of 4711 for 100pc. I put the weight of 4711 as 1lb. So the "Dim." tab on the Packing Instruction shows:

Packaging                   1     LB

Load                         100    LB

Total                         101     LB

Allowed load.wgt        0     LB

"Maintain weights manual." is not checked

Permitted load       100     LB

I have added 4711 as a reference material to Material 'MAT1' and 'MAT2' both weighing 10lbs per pc.

I have an Order like:

When I create the Delivery, I would like to see something like:

Not just one Handling Unit because to total Quantity is less than 100.

I have tried checking "Maintain weights manual." and entering '100' in "Allowed load.wgt" but it isn't causing more HU's to create.

Any help would be great.

Again, I want Auto Packing to create Handling Units based on Allowed Weight, not Quantity.