synopsys set_output_delay
Here are some example!!!
Assume your output port(OUT1) need pass logical circuit to another DFF input.
assume logical delay max 14ns(worse case), min 4ns(best case)
and DFF need 0.8ns setup time and 0.4ns hold time
the min external delay time is (min. path - hold time) = 3.6 and the max
external delay is (max path + setup time) = 14.8
your constraint maybe like
create_clock -period 40 waveform { 0 30 } find(port CLK)
set_output_delay -clock CLK -min 3.6 -max 14.8 find(port OUT1)