From the Item Card you can go from the new field Accessory to the table Item Accessories. There you can set up the accessories.
If you insert the quantity in a sales line of type item with accessories and correct document type it will open the Apply Accessory page.
If you change the no. in a sales line with the correct document type and the quantity is already filled then the Apply Accessory page will also open.
You can set up the correct document type in the Add. Item Setup.
When you accept the page, all the selected items, resources or G/L accounts with the specified quantities will be inserted.