Praichura,
I tried a project (copy) where I already had an old bill of materials and changed the projecttype to 'Form project'.
I opened the project and clicked on the insertpoints of a bill of materials. I could look at and change the type of the element e.g. 645-total price. You can also see all the type of element what you can use in a bill of material.
Then you should try 'edit' (4th menu from the right) and choose 'create macro/form' -> 'Form'.
Like this you should also be able to create your own page-layout.
regards,
Ivo