Any way to use Stream.CopyTo to copy only certain number of bytes?

Is there any way to use Stream.CopyTo to copy only certain number of bytes to destination stream? what is the best workaround?

Edit:
My workaround (some code omitted):

internal sealed class Substream : Stream 
    {
        private readonly Stream stream; 
        private readonly long origin;   
        private readonly long length; 
        private long position;        

        public Substream(Stream stream, long length)
        {
            this.stream = stream;
            this.origin = stream.Position;
            this.position = stream.Position;
            this.length = length;            
        }

public override int Read(byte[] buffer, int offset, int count)
        {
            var n = Math.Max(Math.Min(count, origin + length - position), 0);                
            int bytesRead = stream.Read(buffer, offset, (int) n);
            position += bytesRead;
            return bytesRead;            
        }
}

then to copy n bytes:

var substream = new Substream(stream, n);
                substream.CopyTo(stm);