Thanks for the replies - saves time!
To keep attributes I can just create simple descriptors ... Just two more findings i'd like to report
- Dissolve will fail, if the involved FeatureClasses do not have the shape-length-field as the last field in the field order. I've seen that with "sort" in early stages. The workaround is to copy the feature-class (or in my case the whole network dataset in its Feature Dataset) once - since that will re-order the fields. But smarter would be s solution where custom fields at the end of the table are acceptable.
- I tried to run dissolve twice on the same network (less attributes - faster net), after changing some settings - and this failed, apparently because the Override Point feature class name is hardcoded and not variable. If I rename it I can re-run dissolve ... maybe the tool should be smart enough to change the Override Point Feature Class name, if the pre-set name is already taken.
Regards
Guenter