How to attach a dms stored document in a custom program

Dear Sir,

We have developed a screen user interface for feeding of data related to product performance . The data is being save in a z table . We have a document (say product catalog) which is stored in DMS . While feeding of data , we want to provide an option to user for attaching of document which are lying in DMS . The given document will have a link with the primary key of the product performance record .

We request SAP gurus to kindly guide us about the steps to be followed for attaching of the document .

With Regards

B Mittal