okay, got it, i now want to make multiple collision polygons on image... is this possible?
No, you can only have one collision mesh per sprite. What you can do, also to reduce the number of collision points in the mesh, is to create collision sprites, these you place where you want collisions to happen and then turn them invisible. So you don't use your actually level image as collision mesh but these. Just make them small (32x32) in the sprite editor and then you increase there size in the editor it self, to reduce the amount of memory used.
Alternative you design your level, so you have a background, and then all the parts you want the player to collide with you add on top of the background and then you can set up collision for these.