[Koha] Full text document attachment

Dear Friends,   I am trying to attach full text document with the koha bibliographical records. The marc field 856 is used to give the local URL but on checking I realised one need to give full path eg. http://192.168.0.1/abc.pdf The pdf files are stored in var/www directory.   I need to avoid the local machine numbers otherwise in future if the machine number is changed or the data will be transferred it will cause the path problem. I need to search only bibliographical details not the full text term.   Please suggest the right way how the full text are handled in Koha.   Looking forward to hear from you.   Regads, Akhlaq Ahmed, New Delhi