Hi Robert,
many thanks for your response.
We use VX.1 It seems that this functions is already available at this release.
At first I was confused because I tried to use the UPDATE SYMBOL IN DESIGN option in the schematic editor. But this option is not available in the schematic editor.
But after starting the Symbol-Editor by using the EDIT LOCAL SYMBOL option, I find the Update function in the file menu .
Thank you very much for your help.