Dependent Lists with Index function

Hi,
I posted a thread last week asking for advice on how to create a complex dependent list. I was given advice to look at the Contextures article on creating dependent lists with Index. I followed the instructions in this article on creating a dynamic list and it appeared to work in a new spreadsheet however I need it to work in my existing spreadsheet (attached) for Columns C,D and F.

How do I change the references detailed in the article to work in my Costings! input sheet for cells C6,D6 and F6? My validation lists are in Validations! worksheet.

The existing references detailed in the tutorial are as follows:
Master - =Lists!$A$2:INDEX(Lists!$A:$A,COUNTA(Lists!$A:$A))
ValData - =Lists!$A$2:INDEX(Lists!$1:$100,100,COUNTA(Lists!$1:$1))
Counter - =COUNTA(INDEX(ValData,,MATCH('Data Entry'!A2,Lists!$1:$1,0)))
UseList - =INDEX(ValData,1,MATCH('Data Entry'!A2,Lists!$1:$1,0)): INDEX(ValData,Counter,MATCH('Data Entry'!A2,Lists!$1:$1,0))


Any help would be greatly appreciated as I am a noob with excel.