SQL pick condition string case by case grouping

this is my data where Processname and ProformaInvoiceNum. data is group by progrmainvoicenum.

i need a new column name of main process. if proformainvoicenum have process name 'top cutting' then on that main process feild value show top cutting in that group proformainvoicenum. also if 'top cutting' not exit on that group and 'cutting' is there then 'cutting will be comes on that group profromainvoicenum like below table expample

please help to achived the result

Use a case expression with exists sub-query to check for the required condition

select 
case when exists 
          (
              select * 
              from   yourtable x 
              where  x.ProformaInvoiceNum = t.ProformaInvoiceNum
              and    x.ProcessName = 'TOP CUTTING'
          ) 
     then 'TOP CUTTING'  
     when exists 
          (
              select * 
              from   yourtable x 
              where  x.ProformaInvoiceNum = t.ProformaInvoiceNum
              and    x.ProcessName = 'Cutting'
          ) 
     then 'Cutting' 
     else 'Front Cut' 
     end as [Main Process]
from yourtable t