Adding extrafield's product to invoice

Hello,
I use Dolibarr V16 to manage a wine business, so I added 2 extrafields to my products, one Winemaker (id: vigneron) and another Year(id: millesime).
The Year field is a character field;
The field Winemaker is a list of values retrieved from the suppliers in the following way:
societe:nom:rowid::code_fournisseur IS NOT NULL.
My product management is working fine like this.
My question :
How to integrate these 2 fields on my customer invoices? I have tried using calculated fields or even by directly modifying the php template of the invoices but I am stuck.
Do you have any ideas?
Thanks in advance,
Julien

Add extra fields to Invoice->lines.

Thanks for your response milenmk.
But as I said, I tried to use extrafields in Invoice->lines but I don’t know how to configure it…
Can you help me ?
Thanks in advance,
Julien

Try with “product_extrafields:vigneron:fk_object::fk_product”

I will, but with wich kind of “type” ? I already tried “list from a table” and “link to an object”

Should be “Select from table”