It sounds very much like you have a custom field on your opportunity table that creates a reference number that is visible to users (as opposed to the opportunity id which is normally hidden).  To link order and quote references to that number then you would need to add additional custom functionality.  As @Vega has suggested, you may want to ask yourself what you are trying to achieve.

It sounds very much like you have a custom field on your opportunity table that creates a reference number that is visible to users (as opposed to the opportunity id which is normally hidden).  To link order and quote references to that number then you would need to add additional custom functionality.  As @Vega has suggested, you may want to ask yourself what you are trying to achieve.