General and assembly settings can be found and set on the Settings > General page.
If parts are assembled by default, toggle the ‘Price includes assembly’ ON. In this case, enter 0 in ‘Assembly charge per item’ and provide a knockdown discount.
If parts are not assembled by default, toggle the ‘Price includes assembly’ OFF.
In this case, enter 0 in ‘Knockdown discount’ and provide an assembly fee in the ‘Assembly charge per item’ field.
How the value inside the ‘Assembly charge per item’ or ‘Knockdown discount’ is treated, depends on the ‘Assembly charge type’. If ‘Flat value’ is selected, then the assembly charge/knockdown discount will be the exact value as entered. If ‘Percentage’ is selected, then the Assembly charge/Knockdown discount will be a percentage of a part price.