how to transform from analog Bandpass filter ----->equivalent Lowpass filter

Transformation from analog Lowpass filter to Bandpass filter is
obtained by following steps
1 - desing low pass filter having specifications of bandpass filter
2 - obtain transfer function of lowpass filter
3 - subsitute
s' = [(s^2+wo^2)/s] into Lowpass Tansfer fn to obtain banspass
Transfer fn.

but how can we transform a BP filter to Lowpass filter in analog
domain.....
if anyone has an idea ...plz repond
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