How to create databse for purchase order in mysql please give me some good structure

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MySQL

i want to know how should i store the foreign key in order_item table so that it identifies the order and estimate/invoice/purchaseorder it belongs too.

What I have tried:

table name: order relates to (contact, estimate, invoice, shipment) tables.
column name: contact_id (foreign key(referring to id column of the contact table)).
column name: estimate_id (foreign key(referring to id column of the estimate table)).
column name: invoice_id (foreign key(referring to id column of the invoice table)).
column name: shipment_id (foreign key(referring to id column of the shipment table)).

tablename: purchaseorder (this have one to many relationship with order table)
column name: order_id (foreign key(referring to id column of the order table)).
column name: contact_id (foreign key(referring to id column of the contact table)).