Create Publication v12

[Mike L <giantmetfan@xxxxxxxxxxx>]

I understand in version 15 functionality was added to allow to create a publication for all tables within a schema. How would I need to do this in v12?
Ex.
Schema1:
Table1
Table2

Schema2:
Table1
Table2

?

The documentation for 12 does not show schema.table just table names

Thanks in advanced.