Hi,

You have to install the module the accounting. Then you have to go in the accouting module and click on supplier invoice below the supplier menu.

Click on create and begin to fill the supplier invoice.

If you want to create an asset in one move :

Add the technical features to your user. Go on setting => Users => Users. Edit your user, go in the Access right tab and check the option Technical features.

Install the asset management module. Then in the accounting module go in the menu configuration => Assets => Assets Categories and define an asset category.

Then do the whole process of creating a supplier invoice again and this time in the invoice line choose the asset category that you want to assign to the futur asset.