Import data
There are two ways to import data to PREFAB: using the current calculations from FEM-Design, or loading a previously calculated model.
Using current calculations
The most basic option is to load the current calculation using the import button in PREFAB.

Load old calculated model
Using File ➔ Load, it's possible to load any old FEM-Design model, as long as it contains results from analysis and is compatible with PREFAB.
