The wacsselin utility is new in Wacs 0.8.6 and is rather simplistic. It reads the selection XML file and recreates the entries in it that refer to sets or models that the destination WACS server currently has installed. It ignores - but not necessarily silently - any entries in the file that refer to sets it doesn't have. In future versions it will hopefully create download records and maybe even models to facilitate the more thorough process of adding the entries it needs. Using wacsselin is simple enough:

% wacsselin conn30.xml
% 

The above command will import all entries from connection 30 as saved in an XML selection file of a connection into the connections area of the current WACS server. It will be allocated the next available connection number, unless the command line option --clone is specified in which case it will be the connection number as specified by the XML file.