Tenant schemas issues

Hi ,
i am writing application with tenant schemas using django , i have created tenents per schema so now i have different sites
like t1.abc.com

t1,t2,t3 are different tenents(schema) for me
now i want to add tables to the each of the schema through common data_admin app
for t1 i want to add tables a,b,c,d
for t2 i want to add tables a,c,x,y,z
for t3 i want to add tables l,m,n,y,z

i created app data_admin whose models.py would contain definition of all these tables
but if i migrate that it will create all the tables in all schemas
t1 ,t2,t3 all schema will have all tables a,b,c,d,x,y,z,l,m,n

how do i avoid that ?
is there way to create tenent specific tables

am i missing something ?