If I plan to move far away (my case Europe) will my natal chart be 'erased' for ever and the relocation chart be my new chart for good? I have been studying my relocation chart and I know my ASC & angles are different though I wonder if one resides somewhere permenently will the natal chart never be felt? I like my natal a lot more than my relocation chart. In my natal I have so many planets in the ninth house maybe this is why I want to travel and further my education. Now my relocation chart most planets are in the 6th house. What happens to your natal chart, is it still part of us and still play a part in our lives? With synastry/composite should I always use my relocation chart?
No you use your birth place for any natal chart including transits. The logic here is that everything happening is in relation to your source - i.e. birth place.