post2post modification

I have a wordpress website with post2post plugin.

My Posts db table has an additional column ‘Coll01’ where I store a small string.

In the adminnistration side when I add a new article on the right column there are two boxes of Post2Post plugin. There I connect the “new artcle” with old articles. To find the old articles I have to enter part of their Title and Post2Post search and displays the titles of the articles that match the search string.

My question is, how to make Post2Post instead of searching the titles of the articles, to search in the column ‘Coll01’ and return as results the titles.

Thank you