Multi point CTS implementation

I have a netlist and def with single clock port clk.

I want to implement multi point cts with 4 clocks(clk1,clk2,clk3,clk4).They are equilent to clock port clk.

What are the flow steps in encounter to  implement this multipoint CTS.

(How can create 4 new clock ports and remove old clock port clk, how to take care of clock connectivity in the design and implementation of multi point CTS)