I don't know what problems that you are having.
Use gacutil.exe to list all of the assemblies (using "-l" option).
Use gacutil.exe to install an assembly (using "-i" option).
Use gacutil.exe to uninstlall an assembly (using "-u" option).
Is it the case that you have installed an IdeaBlade assembly into the GAC, but can't see the reference to it in "Add References"? In that case, you may need to modify the registry. For an example, look at "My_Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30128\AssemblyFoldersEx\IdeaBlade2010".