I am placing components in board. But there has been some changes made in schematic. component placement is almost over in my board. Now how should i update changed netlist to my board.?
If you import the netlist inside PCB Editor and remember to check the "always place changed components" flag then the existing placement will be preserved. Even if a package symbol (footprint) has changed it will be placed in the same position (based on the reference designator)
Also if you do not check 'allow etch removal' then all your existing etch will exist and you can make adjustments to eliminate DRCs that may happen when you import a new netlist.