Sort the results by three sets with a subset

select stampata_sn,numero_conto,dest_stampa,portata,categoria,prog_inser,nodo,desc_art,prezzo_un,quantita from comanda where contiene_variante='1' and ntav_comanda='25' and posizione='CONTO' and stato_record='ATTIVO'   and numero_conto ="1" 

                        union all

select stampata_sn,numero_conto,dest_stampa,portata,categoria,prog_inser,nodo,desc_art,prezzo_un,sum(quantita) as quantita from comanda where (contiene_variante !='1' or contiene_variante is null) and length(nodo)=3 and ntav_comanda='25' and posizione='CONTO' and stato_record='ATTIVO'  and numero_conto ="1"  group by desc_art

                        union all

select stampata_sn,numero_conto,dest_stampa,portata,categoria,prog_inser,nodo,desc_art,prezzo_un,quantita from comanda where length(nodo)=7 and ntav_comanda='25'  and posizione='CONTO' and stato_record='ATTIVO'  and numero_conto ="1"  order by nodo asc;

I have this three queries.

If the first query before "union all" is the query A, and the second and third are B and C, how can i do:

(A(B ORDER BY B ASC),C) ORDER BY (A,C) ASC

I need to do:

Extract A
Extract B of A (by node) AND order alphabetical in the internal
Extract C 
Then order by A (and B is an A subset),C alphabetical

Then the result will be for example

C   Bitter
A   Coca
B   + Ice
B   + Lemon
B   + Orange juice
A   Juice
B   + Lemon
C   Orange cup
C   Spaghetti

instead of a random order by node, like:

C   Orange cup
A   Juice
B   + Lemon
C   Bitter
A   Coca
B   + Orange juice
B   + Ice
B   + Lemon
C   Spaghetti

I hope to been clear.

Thank you.