with ref. attached pic, i have added child_1,2 config programatiacally. In which i want all dimensions to be linked to parent, except one dim 45mm. 
to achive this 1st i added the child config by using following code:-
swConfigMgr.AddConfiguration2("Child_1", "", "", swConfigurationOptions2_e.swConfigOption_LinkToParent, "Parent_Config_Name", "", True)
 
form above child configration is added, Now i want one of the dimension to be this config, to achive this i have added the following code:-  
boolstatus = oDoc.Extension.SelectByID2("Name of Dimension", "DIMENSION", 0, 0, 0, False, 0, Nothing, 0)
boolstatus = oDoc.Extension.EditDimensionProperties(swTolType_e.swTolGeneral, 0, 0, "", "", True, 9, swDimensionArrowsSide_e.swDimArrowsSmart, False, swArrowStyle_e.swSLASH_ARROWHEAD, swArrowStyle_e.swOPEN_ARROWHEAD, "", "", True, "", "", "", True, swInConfigurationOpts_e.swThisConfiguration, "Child_Config_name")