Programming :: Modify Script Loading Array With Ranges Of Lines In Awk?

As awk programmers may know, we can print range of lines with awk, from an initial pattern until a final pattern as follow:

Code:

awk '/Initial_String/,/Final_String/' inputfile

Well, I have this inputfile:

Code:

[code]...

Once having those elements in that way within an array(a[]), I want to be able to manipulate the array (a[]) and copy its elements
to another array (b[]) in different order (all lines joined in a single line separated with commas), as follow:

Code:

Category,Adventure,Titles,Robinson,Crusoe,Saturday,Authors,Daniel-Defoe,Ian-McEwan

Only inserting the missing "array" coding and based and follow the code I've written Not needed to create a new code to do it with other method.