Macro To Auto Filter - Show Records With Same Code

I have a form that has numerous fields, there is one field that is called the "Relationship Code" it gives any customers who have a certain relationship a 3 digit number. I would like a command button that you can press that will take the current record shown and filter their relationship code, to only show those records who have the same code. I know this can be done by going to the field>right clicking>and saying Equals " ". But I want a button with code that will do this automatically.