In a index, is there a way to sort the items inside a letter not alphabetically, I mean, in appearance order? or maybe there is another way to do it.

I have now:

A

 arbol

   blanco,    15

   rojo,         4

   verde,     23

 

 araña

    grande,   50

    linda,      12

I want:

Thankyou in adavance.

--------------------

Horacio Suarez