DissolveForms

FormUtils.DissolveForms(Document, ICollection<ElementId>, ICollection<ElementId>, ICollection<ElementId>)

ADoc	Document	The document
elements	ICollection<ElementId>	A collection of element IDs of Forms and GeomCombinations that contain Forms that will be dissolved.
ProfileOriginPointSet	ICollection<ElementId>	A collection of the point element ids that represent the 'origin' of the profiles
BondingPointSet	ICollection<ElementId>	A collection of the point element ids called "bonding points" (see below for description of "bonding points")
→ returns	ICollection	A collection of curve element ids from the profiles and paths of the dissolved forms.