Athento has an operation that allows you to move documents automatically between spaces. The name of the operation is Change document to serie.
To install this operation, simply go to the marketplace of available operations in the "Operations" tab of each space and click on the "Install" button on the operation.
After installation, you need to edit the parameters to configure to which space the document should be moved.
The simplest configuration is with the "Series" field, where the internal name of the space to be changed must be indicated.
Another configuration that allows is to obtain the target space from a metadata, for this you must put the internal name of the metadata in the "Metadata name" field and if this list of spaces is in mastertables, you must bring its API .