Creating a (Manual) Purchase Order in Helm

Manual Creation
From the sidebar go to Purchasing->Purchase Orders
Press the Create Purchase Order button
Select Create Manual PO
Add a PO Number
Select your supplier from dropdown (can be yourself)
Suppliers can be created on the Contacts page if needed
Set warehouse to Warehouse
Add an expected delivery date
This will load up a full Purchase Order page that should be fairly simple to understand
There may be no delivery address, but as it's coming to the warehouse you will want to set the details to:
Units 13-17 Riverside Industrial Park
Moody Lane
Grimsby
North Lincolnshire
DN31 2AN
Click Add Inventory, you will need to do this for each individual SKU you are adding
Select the relevant item that is getting sent to the warehouse
Set the quantity to the amount that is getting delivered
Click Create
Final Part
Once the PO is added and looks good/has been sent wherever it needs to be sent this needs to be set as Submitted.
To do so, select the dropdown at the top-right and choose Submitted.