With Dolibarr, you can manage your supplier orders added of a supply features.
Supplier orders follow the same procedure as customer orders : select in the drop down list the product to add.
You can decide to use a 3 steps approval depending on an amount.
Make your order and use the stock dispatching command to place your product in your warehouses :
Increasing stock movements will appear on warehouses and products cards :
A functionnality of automatic replenishment will help you, advising a quantity of products to order :
Replenishment can be made per warehouses and per supplier.
Then, select the best suppliers in the list. A command will create as many draft orders as suppliers selected.