Click on the "Parts/Tyres" tab and select "Stock Adjustments".

Create a new Stock Adjustment Group by clicking "New". Name the group, for example, 'Full Stock', and fill in the Reference and Description fields. Then, click "Save". The Stock Adjustment group will now appear in the top half of the Stock Adjustments view.

You may create different Stock Adjustment groups for specific types of stock if needed.

Select the desired Stock Adjustment group, such as 'Example'. (1)

In the bottom half of the screen, click "New" and then select "Part Adjustment". (2)

This will open the list of parts. Use the search bar or scroll down to find the part that needs adjusting.

Highlight the part by clicking on it. Then, choose whether to "Add" or "Subtract" (1) from the stock, specify the "Quantity" (2), and click "Save" to adjust more stock or "Save And Close" to close the window. (3)

The part's stock level will now be adjusted accordingly. You can see the updated stock level in both the "Parts List" and the selected "Stock Adjustment" group.