This is a product idea conversion of case C13653677. In Creo, if the diametric dimensions are moved to a different plane (from its default plane) an extended arc gets created as witness lines. Currently there is no way to determine the definition of this arc (used as witness line) for diametric dimensions; in Pro/TOOLKIT no API support is available that could provide the requested extended Arc information of a diameter dimension. Without this information, Creo PMI cannot be represented correctly in other derived formats for downstream usage. This gap results in wrong visual representation of PMI, therefore we need support for this information in Pro/TOOLKIT.