To create an inventory transfer:
Go to "Inventory" from the menu. Then click "Transfers".
Click "Add new".
Select a warehouse and click "Create".
On the next page, select a product you want to transfer and click "Preview Transfer".
Choose the location where you want to transfer from, put the quantity of the products you want to transfer, select the destination location, then click "Add to transfer".
Click "Preview Transfer".
Review the details of the transfer.
If there is something you need to change/add, click "Update" or "Manage".
If everything is okay and correct, click "Complete Draft".
On the Transfer Items section, click "Complete" next to the details of the transfer you created.
The Complete Item Transfer window will pop-up. Put the quantity of item you already move. Click the radio button before the text "I already moved the products" to put a check mark. Then click "Complete".