Let's suppose we have the A and B schemas and you want to copy the tables from A to B.
For this reason you just to ensure you have the correct "grant" permission for the B schema for all tables from A schema that you want to action. For example:
grant insert on X to A;
where X is the name of the table. This you should run from the B schema.
Afterwards, you just run (in the B schema) the creation script for the table (you can get from TOAD) and then:
(A schema): grant select on X to B;
(B schema): insert into B.X select * from A.x; (from A schema)