[Koha] cloning 856 $u

Dear friends, We want to attach several URLs to the MARC record. Since the 856 $u field is repeatable, we have decided to clone the subfield several times. Yet, when we search for the record in the OPAC, only the first link is displayed in the results' page, meanwhile the other ones are not visible at all.  We have a similar problem with the 856 $y field as well. All subfields are concatenated in one field and are displayed as a one text.  We want to have all links each one with its appropriate text value, and of course, displayed separately. Is it possible? Thank you in advance, Haik.