One table record can assign multiple records in second table dynamically

Hello everyone.. How can I assign records from one table to many records in second table. The thing is I have 5 records in table1 and 5 records in table2. Each record from table1 can be able to assign many records from table2.(1st record from table1 can have 2,3,4,5 records in table2). How can I do this. Can anyone help me in this issue?