Divide fleet in groups

Hi,
My name i Carlo Tosi . I am General Manager of Club Nautico Scarlino ( Italy). At the end of March I have a Race of Optimist e I must divide the fleet in two groups. I don’t remember as make to program Sailwave. I try to explain :

-Fleet race with over 100 boats - 6 races in two days. I must divide the fleet in two groups : Yellow and Blu

-I put the entry list in alphabetic order (name) and the I assign colors with this system:

TABEL :

Name Yellow Blu

A X

B X

C
X

D X

E X

F X

G X

H X

I X

L X

etc…

-3 races in the 1st day

-1st race : yellow and then blu

-2st race : yellow and then blu

-3st race : yellow
and then blu

-At the end of the first day I newly assign the colors using the same total but listing the competitors non more in alphabetic order but following the general results of the first day.

-DNF, DSQ, OCS, etc. = Nr competitor in the group + 1

Thank you and best regards

Carlo Tosi