is it possible to ported any cfw from any rm to rm 505 ?

yes , but port will be from  s60v5...

i have empty core, uda, and rofs2 rm 505, what next should i prepare to do ?

i have empty core, uda, and rofs2 rm 505, what next should i prepare to do ?

this tutorial will help you http://forum.gizmolord.com/custom-firmware-discussions/ultimate-tutorial-to-create-your-own-custom-firmware-(cfw)-(by-lrajesh555)/

is it mean that i may copy any rofs2 to my empty rofs2 ? (eq. rofs2 sfr rm 559 to my empty rofs2) 

is it mean that i may copy any rofs2 to my empty rofs2 ? (eq. rofs2 sfr rm 559 to my empty rofs2) 

try to do that but you have to made many modification according to your rm and maybe first time the phone will be dead but don't worry flashing with original or previous one can revive your set , so it is a really hard working work  so better to take guidance who have n97 and can modified the s60v5....... like bazara .....

anyone can give me link to best of the best cfw for n97 rm 505 ??? pleasee