Nested switch statements?

Hi 

I have two conditional columns [FROMDASHBOARDSTATUS] AND [FROMOFFSHORESTATUS]

I am trying to apply some logic to different scenarios depending upon the result in either [FROMDASHBOARDSTATUS] or[FROMOFFSHORESTATUS].  The DAX formulae i have is:

FINALSTATUS = SWITCH(
       TRUE(),
       'PFUpdates'[FROMDASHBOARDSTATUS]="Approved - Modified",'Panel Firm Updates'[FROMOFFSHORESTATUS],
       'PFUpdates'[FROMDASHBOARDSTATUS]="Approved - Paid in Full",'Panel Firm Updates'[FROMOFFSHORESTATUS],
       'PFUpdates'[FROMDASHBOARDSTATUS]="Unapproved","Awaiting approval in Dashboard",
       'PFUpdates'[FROMDASHBOARDSTATUS]="Disputed","Disputed in Dashboard",
       'PFUpdates'[FROMDASHBOARDSTATUS]="Rejected","Rejected in Dashboard",
       'PFUpdates'[FROMDASHBOARDSTATUS]="Reversal","Reversal in Dashboard",
       'PFUpdates'[FROMDASHBOARDSTATUS]=BLANK(),"No Record",
       'PFUpdates'[FROMDASHBOARDSTATUS]="Unknown",'Panel Firm Updates'[FROMOFFSHORESTATUS])

The above works ok apart from one niggling issue (ill explain below) also, i would like to  add one more statement:

'PFUpdates'[FROMOFFSHORESTATUS]="Unknown","Unknown" but i beleive i cant add this because the starting value ( 'PFUpdates'[FROMDASHBOARDSTATUS]) is a different conditional column to the rest.  I thought a nested switch statement would help to add this additional value but i dont know if that is possible?  If anyone can advise that would be great.  

Regarding the niggling issue..... the statement above " 'PFUpdates'[FROMDASHBOARDSTATUS]="Approved - Paid in Full",'PFUpdates'[FROMOFFSHORESTATUS]," is basically stating if  'PFUpdates'[FROMDASHBOARDSTATUS] has a value "Approved - Paid in Full" then use the corresponding entry result found in 'PFUpdates'[FROMOFFSHORESTATUS] but... my question is if  'PFUpdates'[FROMOFFSHORESTATUS] is BLANK() then i would like the result to be "Transferred to EDM".  Am i able to modify the statement to also look for the blank values in 'PFUpdates'[FROMOFFSHORESTATUS] after it has looked for "Approved - Paid in Full" in 'PFUpdates'[FROMDASHBOARDSTATUS].

Any help greatly appreciated and i hope this is not too confusing?

Paul