How Do I Save Data In The Master Table, After Selecting Values From Combobox., Taken From Another Table.

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database

Have created 3 Tables in database, with relationship.
Have created 5 fields in each table.
Need assistance in order to display the content one field from one table, using combo box.
After running the project. i should be able to select value from the combo box taken from the table and the value must be stored along with the contents of the master data file.

For example.
1) Company database(many companies)(......n)>
2) Specific company selected (From Grid)
3) Selection of contact person from the contact person table in combo box.
4) After selection of contact person from (....n) this value must stored in the Company database.
5) After recalling the database the final contact person selectd from within a number of people from the contact table must be seen in company contact table.

Can some bright minds, shed some light.
Thanks in anticipation.