Hello,
at the moment, Sales Category POST/PUT operations aren't exposed via Inventory endpoint. Please create a new idea at the Ideas section then this will be evaluated by the development team.
In terms of GET, Sales Category that is assigned to the Inventory can be fetched through Inventory Endpoint by filtering with SalesCategory ID.
Example: GET> https://integration.visma.net/API/controller/api/v1/inventory?salesCategory=1
(Visma.net ERP API Documentation: https://integration.visma.net/API-index/)
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