You can edit your Reference Filter Settings in Synchronize to specify which listings you wish to transfer, by listing prefix.
For example, if you wish to synchronize any listings which have the ID prefix 'PP', enter 'PP*' into your Reference Filter field.
To edit your Reference Filter, open SalesPartner > More > Synchronize > Settings > Modify Server
Enter your desired listing prefix's followed by an asterisk, for example: PP*
To enter multiple reference filters, separate each filter by a space, for example: PP* RE*
Tip: RE* is a commonly used filter for transferring REINZ sales statistics.