Don't start by defining parts and determining variance using complex rules.
No, first determine the variance and then let the parts define themselves automatically.
Variance begins in engineering by parameterising parts, drawings and parts lists.
VULCAN imports this CAD data and creates parameterised parts with parameter-controlled parts lists.
New product configurations are only created by specifying the parameters.
These are exported from VULCAN to the leading ERP system as parts, parts lists and work plan data.