When you use our SOAP or REST web service APIs you will often times want to retrieve a filtered list of data. This is done by using the RemoteFilter that lets you query the list of requirements, test cases, tasks, incidents, etc. and pass in the field to be filtered. This article includes the list of standard fields that you can use in the RemoteFilter.
We have a migration tool that makes it easy to move from HP ALM (aka Quality Center) to SpiraTeam. This article provides some more information on exactly what is migrated in each module.