Update field using data from View

I have a table in my database called crmAfterCareData. I've also created a View that holds some info from another table (crmApplicationData_ToUse) and some data from crmAfterCareData. My View looks something like this:

SELECT     TOP (100) PERCENT dbo.crmApplicationData_ToUse.BusinessRef, dbo.crmApplicationData_ToUse.App_No,
                      dbo.crmAftercareData.App_No AS AC_App_No, dbo.crmApplicationData_ToUse.PSYBT_Loan_Applied_For,
                      dbo.crmApplicationData_ToUse.PSYBT_Grant_Applied_For
FROM         dbo.crmApplicationData_ToUse LEFT OUTER JOIN
                      dbo.crmAftercareData ON dbo.crmApplicationData_ToUse.BusinessRef = dbo.crmAftercareData.BusinessRef
WHERE     (dbo.crmApplicationData_ToUse.PSYBT_Loan_Applied_For > 0) AND (dbo.crmApplicationData_ToUse.PSYBT_Grant_Applied_For > 0) AND
                      (RIGHT(dbo.crmApplicationData_ToUse.App_No, 1) = 1) AND (RIGHT(dbo.crmAftercareData.App_No, 1) = 2)
ORDER BY dbo.crmApplicationData_ToUse.BusinessRef

and the returned data looks something like this:

BusinessRef      App_No      AC_App_No      PSYBT_Loan_Applied_For      PSYBT_Grant_Applied_For
01-00008      01-00008-1      01-00008-2      750      750
01-00009      01-00009-1      01-00009-2      2000      750
01-00023      01-00023-1      01-00023-2      5000      2000
01-00072      01-00072-1      01-00072-2      2000      1000
01-00091      01-00091-1      01-00091-2      5000      1000

I have about 12500+ records in this table all with data like the above.

What I need to do is to update the crmAfterCareData table and overwrite AC_App_No with App_No where BusinessRef in the crmApplicationData_ToUse table = BusinessRef in crmAfterCareData but only the data contained in this View shoulld be used as I have about another 30000+ records in the crmAfterCareData table that should not be updated at all. Some of the other data also has the same BusinessRef numbers as the table above but they don;t match the criteria check done in the View and as such they should not be altered.

Any ideas how I can go about this?