inheridt tables from db

hi

i am considering to port an important web applications to postgres,
this applications is made of php and i reuse the same code for many
customer, due to have a clean structure and simple updates...

now i have one code and many databases in mysql...

i know that with postgres i can inheridt some properties...can i have
a main database, called A and then many databases, Customer1,
Customer2, Customer3 and if i made a change in A the changes is
replicated to Customer1,2 and 3?

for example:

MAIN DB
-> table 1
-> table 2
-> table 3
-- -- CUSTOMER DB 1
-- -- -> table 1
-- -- -> table 2
-- -- -> table 3
-- -- CUSTOMER DB 2
-- -- -> table 1
-- -- -> table 2
-- -- -> table 3
-- -- CUSTOMER DB 3
-- -- -> table 1
-- -- -> table 2
-- -- -> table 3

if i add table4 to MAIN DB automatically i got:

MAIN DB
-> table 1
-> table 2
-> table 3
-> table 4
-- -- CUSTOMER DB 1
-- -- -> table 1
-- -- -> table 2
-- -- -> table 3
-- -- -> table 4
-- -- CUSTOMER DB 2
-- -- -> table 1
-- -- -> table 2
-- -- -> table 3
-- -- -> table 4
-- -- CUSTOMER DB 3
-- -- -> table 1
-- -- -> table 2
-- -- -> table 3
-- -- -> table 4

if i add a table to CUSTOMER DB 2 it is added ony at db2...

is it possible? thanks