Julia,
If you have your entire webMethods product table sitting in DB2, and you want to migrate to MS SQL, it might not be good idea to choose to export/import schema options.
If it is a new environment, then it is better if you use the db scripts provided in the product installation to create the tables, and point your environment to this.
If this is a production environment, or existing environment, do you have any in-flight data that needs to be moved?
There are no out of the box scripts that can move data between two different databases.
-Senthil