With Tekla EPM Open API you are able to retrieve and update inventory, production, and shipping status. Update inventory stock, production or shipping status Let’s have a look at the EPM API and what you can do with it. Tekla EPM Open API is an application programming interface into Tekla EPM (Estimating and Production Management), the steel fabrication management software. Tekla Partnerships Team hopes that this short introduction encourages you to explore the power of Tekla software APIs and read further documentation. Learn what you can do with the three Tekla APIs included in your Tekla Partners Program Suite!