copy product and inter relation beetween table

when i copy a product , some already define item values disseppear in the new create( copy) product .
Is there a way to avoid at each new copy process to redefine all the input form value .
for example
the price,
the category,
Product available until date
max qantities per order
min quantities per order
ARE not REUSE even be set .
I only want redefine 3 items ( name ,code, serial )

when create new product Does the directory of name "Product category" behave like "brand".
I mean by this does a product can have BOTH a brand and a "Product category" ( hiearchy category )

I see in table $_hikashop_product column of name manufacturer_id vendor_id . Howto understand this two item with the brand label ? . Manufacturer = brand ?

Does the object model of hikashop let us understand discover wich columns are use to create a new column in another table? ( how table cell integrity are link and check ? )

Regard's