Trying to make a way to allow sideways movement while doing a physics slide

     if(sliding && Input.GetKeyDown(crouchkey) && !running)
     {
         sliding = false;
     }
     else if(Input.GetKeyDown(crouchkey) && !sliding && running)
     {
         running = false;
         sliding = true;
         rb.AddForce(moveDirection * extraslideforce * rb.mass, ForceMode.Impulse);
     }
     if(sliding)
     {
           // (i don't know how to keep it slowing down but allow the player to move a bit)
             rb.AddForce(slidemoveDirection.normalized * slidemovespeed * rb.mass, ForceMode.Force);
     }

     if(rb.velocity.magnitude <= (basemovespeed * 0.6f)/12.5f)
     {
         sliding = false;
     }

this code is to manage a first person physics slide where if the velocity gets under a certain speed it stops sliding automatically (using the drag values of the physics system if that's important), i'm trying to implement a way so that the player can make adjustments to the sliding however adding a force just adds to the velocity