MI Help needed for Ecological problem

[Lavinia Irving]

I need to locate multiple data items into a single polygon.  Mapinfo will only allow a single data item to occupy a single polygon using create thematic map.  I  want my data to exist in a polygon as a dot denstiy of individual pieces of data.  The data is butterfly recorded sightings at a number of different sites where each species needs to be represented within each polygon, representing site, in order to make the dataset useful.  Can someone help me with this?