Import STEP file

The process to import as STEP (.stp) file is similar to importing an Excel file with parts.

It is possible to handle parts according to the STEP-model
(Standard for The Exchange of Product model data), often used by
CAD software.
This extended part handling in AviX makes it possible to handle
versions and different levels in the part structure and also to add
extra information e.g. length, volume, and weight.
This extension creates a good way to work with D-FMEA and DFA
analysis since the part structure allows the creation of sub-assemblies
and can, therefore, be applied directly in the FMEA and DFA
modules.