for managing inventory go to the inventory page from left sidebar of the admin panel
or you can search it into the search box like this
This is the page that we’re finding here admin will see all the product that admin have created and this page is same for the vendor
Vendor will see only those product inventory those are created by the vendor
Here vendor/admin can edit the inventory item and delete them from this page
For editing click on pen icon button from right side of your item
For example my product name is channel now i will click on the pen button
okay now you’ll see a new page
from this page you can edit sku, quantity, unit and unit of measurement
You can manage product variant from this page custom inventory vairant section
How can you manage variant Read this doc
for updating click on update inventory button then you’ll see success message on top right position of the screen