The article outlines the steps to create a Picking Requisition.
FOLLOW STEPS BELOW:
1. Navigate to New > Product Picking > Pick > By Sales Order
2. Select the Sales Order to be picked.
3. Double click on the applicable warehouse.
4. Auto Allocate and click 'Pick All'
Note: If you do not have stock for a particular size, but want to pick sizes you do have in stock, click the 'Breakline' button before auto allocating. This can be tuned on by default through a business rule.
If you conduct the part pick, and still want to dispatch the remaining units, 'BOrd will need to be toggled in order to create a back order line item for the remaining units.
5. Once confirmed, click 'Create Picking Slips'
NB. For a quick tutorial watch below