Operation insertComposedLinkType (String LinkTypeName, List of Integers ListofComposedLinkID), in Class LinkType

Documentation
if the linktype you insert is somehow a mixture of several link
you give the name of the new link type and the LinkIDs which compose your link type.
Ex:
HLT : lktypeID 2
L1 : lktypeID 3
New link type to insert : Mixed (L1 +HLT) : Mixed, (2,3)