To move one table from its current schema to a new schema, use the following:
ALTER TABLE cust
SET SCHEMA anotherschema;
If you want to move all objects, you can consider renaming the schema itself, using the following query:
ALTER SCHEMA existingschema RENAME TO anotherschema;
This only works if another schema with that name does not exist. Otherwise, you'll need to run ALTER TABLE for each table you want to move. You can use the earlier recipe Performing actions on many tables to achieve that.
Views, sequences, functions, aggregates, and domains can also be moved by ALTER commands with SET SCHEMA options.