How Can i shift (transport) a signal bacward in simulink?

Hi. I am currently working with Simulink. I have a signal which has zero beginning interval for example 0 to 10 s. after the 10 second the signal begin to get values. I want to shift my signal. I mean I want that the time 10, becomes 0. I tried Variable and constant transport delays but non of them would shift it backwards as long as they don't accept Negative values. I would be grateful if you help me through this.