I know what's the template layer in Adobe Illustrator and how it works. It's a great and perfect way to redraw a raster image in vector paths. But today I found out the template feature just works for raster images and objects, not vector ones! Today I received a vector file that objects were created in AutoCAD software, but some paths were not smooth as they created in AI and had a few minor issues that they needed to redraw in AI. So I imported the ai. document that objects (were created in AutoCAD) into AI's Layers Palette and then create a template layer for it and set the dim to 50%, but nothing happened to it and no opacity view for AutoCAD objects in the document appeared!
Why? Without making a template and create a dim and faint color for the AutoCAD objects, redraw the new AI paths are difficult. So I ignored the template feature and change the opacity of AutoCAD objects to 50 ~ 65 and lock the layer and finally create the anoter layer for the new path that I have to create AI paths and it worked and I finished the job. But I wonder why Adobe Illustrator doesn't make a template and dim view for vector paths that generated in AutoCAD or even Adobe Illustrator itself and just only work for raster images.