But it is inconvenience to make update package.
I followed several document and sample, but that didn't work and too difficult.
The best way to make update pacakge is change Product Code, but serveral item displayed in add/remove view.
I solved this problem with custom action.
My custom action find related product ( product that has same upgrade code ).
If found , my custom action remove that .
I made merge module also to make package easy.
I know this is ugly solution, but easy..
I want to upload my source files but this forum doen't
support file uploading..
If interested , mail to min@yours.com
I'll send you all source