The import of KPIs and workspaces is not yet supported in JBoss Dashboard Builder.
The following workaround is suggested:
1.- Export your target dashboard (.cex zip file containing an XML file with the workspace structure) -> MyWorkspace.xml
2.- Export your target KPIs (XML file containing all the KPIs referenced by your dashboard(s)) -> MyKPIs.xml
3.- Create a MyDashboardSampleBuider class which will deploy the previous assets on start-up. You could use the current TeiidShowcaseBuilder.java and update it.
4.- Rebuild the .war and then deploy.