When you define a JDBC pool, that matches one of those options using dbconfiguratorUI.
PRODUCT - Integration Server -> Corresponds to JDBC Urls for ISInternal
PRODUCT - Trading Networks -> corresponds to the IS JDBC pool TN.
PRODUCT - Optimize -> Corresponds to the database URL you configure ( and map ) when configuring environments in MWS to be used with BAM.
PRODUCT - My webMethods -> corresponds to the URL you configure on MWS when define a instance ( which is shared with IS JDBC pool for CentralUsers ).
When you create tables after using one or other options, the log ends telling you the name of the individual components been created.
The option “PRODUCT - XXX” means is a group of separate components which are typically grouped, however you can decide to separate this schemas more, and for that you can follow this guide http://techcommunity.softwareag.com/ecosystem/documentation/webmethods/wmsuite8_ga/Cross_Product/8-x_Software_AG_Installation_Guide.pdf starting on page 27.
At the end you need to decide a proper balance between the number of schemas and URL’s for better performance and easy administration.
For example, if you use same schema for ISInternal, ProcessAudir, Process Engine and TN that means you will configure 1 pool alias, and for the components mentioned you select this pool. This will be easy to administer but can have performance issues.
You can decide create a schema per pool, which will have better performance ( less deadloks ) but will be harder to administer.
I’ve notice you raise lots of questions, but doing a forum search and reading some documents before posting seems a good practice you are not following.