[support] Help to create a panel page in a node's sub-path

Hi everybody, I'd like to create a panel page in a node's sub-path. Something like the already existing "node/%node/edit". I'm using Drupal 6 and tried to do that using the url "node/%node/mynode" but didn't work. Could someone help me? Thanks in advance and sorry if my question is too basic, Luís Maranesi