You can edit these properties on the corresponding properties page. If the part is used within an assembly, they the properties automatically populate from the assembly code.
IJOAhsClampThick::ClampThickness
Specifies the flange thickness of the structure in which the beam clamp needs to be attached.
IJOAhsStructWidth::StructWidth
Specifies the flange width of the structure in which the beam clamp needs to be attached.