Hi @bergeronfrank, if your requirement is to aggregate polygons which have an identical value in a specified attribute (e.g. "_group") and also are within a specified distance (e.g. "_distance") each other, this workflow might help you.

1. Bufferer (Group By: _group, Buffer Amount: _distance * 0.5): Create buffers of the polygons. The buffers that belong to the same "_group" and touch or overlap each other will be dissolved here.
2. Counter: Add sequential number to the buffers as temporary ID (e.g. "_id").
3. SpatialFilter: Send the buffers to the Filter port, send the original polygons to the Candidate port, make sure that the Merge Attributes option is checked. With this setting, "_id" of a buffer will be transferred to the polygons within it.
4. Aggregator (Group By: _group, _id): Aggregate the polygons output from the Passed port of the SpatialFilter, grouping by "_group" and "_id".

You can also calculate the distance between features and aggregate via the neighborhoodaggregator.

Thank you @takashi and @itay. I will try your recommendations