Go to Admin Portal

Navigate to lefthand panel, and select Catalogue<Furniture

Select the correct Category, Subcategory, Group of the SKU to which you wish to set the price.

Choose the correct SKU and select the Edit SKU icon against the SKU name.

Select Edit SKU Properties, and in the window that opens up, select the Pricing (Sales Channel) tab.

Under Manage Default Pricing, select the Price as a Completely Built Unit toggle.

If a window titled 'Your attention is required' pops up, select 'Change CBU status'

Select the desired per unit area measure under the Default Unit dropdown menu, and the rate you add afterwards to be on that basis.

Fill in the Default Price, Tax and Margin as per your wish.

Select Update to save changes, and close the window.