Hi Mary Jo,
You can import/export from the query designer.
SmartDL stores its queries in the extensionData attribute. You can use LDIFDE to export extensionData but extensiondata is encoded byte array making it difficult for humans to read.
We are working on a PowerShell snap-in so you can easly do these operations from a script but it won't be available for some time.
The first option is probably the best bet.
--Robert