Dump specific tables from DB2 database
Check out db2move - it uses export under the covers and offers options to load or import them into the target.

Details are documented here
db2move in KnowledgeCenter

An alternative - for those large volumnes - might be a "load from cursor".
Once you have created the new database and its objects (db2look) can help here you load the data into the new database. For this solution you have to create individual statements for each table.
Check out this article about load from cursor