is there a (simplistic?) formula to convert spot risk PV01 into the forward risk PV01?
For example, if I have a
a) PV01 spot risk : 1yr = 100k/bp, 2yr = 50k/bp, 3yr = 25k/bp
b) how can I project this into the forward risk seen from 0 to 1yr (? k/bp), 1yr to 2yr (? k/bp) and 2y to 3yr (? k/bp)