How to account that in Dolibarr

One typical import:
I have accounts
301 - Supply
304 - Goods
401 - Vendors
457 - Customs
4531 - VAT
50x - cash / bank

  1. Dt 301 and Ct 304 - Debits account “Supplies” with the full amount of the transaction price, VAT, customs tax, transport, etc. Credited “goods” - this one no idea (If I setup in Products account 301 instead of 304 then I will need help to move the goods from 301 to 304 again)
  2. Dt 304 and Ct 401 - A “Goods” account shall be debit and “suppliers / vendors” shall be credited - that happen via Purchase order and invoice.
  3. Dt 301 and Ct 457 - Debits “Supplies” account and credited 457 “Customs taxes” with the amount of duty - This one no idea
  4. Dt 301 and Ct 4531 - The “Supplies” account is debited and 4531 VAT is credited. - This one no idea
  5. Dt 457 and Ct 50x - Debates account “Customs taxes” and credit account from Group 50 (bank / cash) to pay the duty. - this one via invoice "payments"
  6. Dt 4531 and Ct 50x - A VAT account is debited and account is credited from Group 50x (bank / cash) in order to pay VAT - This one via Invoice VAT

For order - How to make the order including the VAT and the customs tax when I will get them when the goods arrive and go through the customs - earlier nobody can say the exact amount!
So I need help for points 1,3 and 4 - Please help!

Any idea?