This article explains how to open a Tekla Structure from VB.Net.
The first step would be to add reference to the Tekla.Structures.Model.dll Assembly:
The assembly can be found in the path “C:Program FilesTekla Structures20.0ntbinplugins”.
Any code written for tekla requires that the application be running. So step 2 would be to manually open tekla:
The code below opens the project located in the path “D:Software ResourcesTeklaSample Project”: