In Illustrator, I create some designs in RGB mode (eg: glow effect and blending mode), If I drag and drop the CMYK document some blending options are changing. So please give me the solution for this problem, I am very confused by this problem...
The blending mode could be changing because there's a color shift caused by going from RGB to CMYK. Assuming you'll be printing it on paper, will it be a (a) home inkjet printer or a (b) commercial press?
If it's (a) an inkjet printer, you can leave it in RGB mode.
If it's (b) press, it will require the the CMYK mode.
If (b), I suggest you change the colors all to CMYK, and redo the blends. It will probably be faster than trying to find how to fix the existing ones.