Need help to update supervisor in Sql - sql-server

Question

I have a employee table , from where I am finding out the supervisor(team lead) and the manager details based on the User ID . I have a SSIS package which appends newly created Users into my table.
Below is what i am doing currently .
appending newly created user ID into my Sql table from the master table.
finding the supervisor and the manager , based on the employee USER ID.
Now , when an existing employee changes his manager or the supervisor, how can I update the new changes from the master table to my sql table. I dont want to truncate and load the table either since this table is used in an application.
here is the query:
-- load new employee details
INSERT INTO [dbo].[Active_Directory_COE]
(
[USER_ID]
, [USER_TYPE_NM]
, [USER_CLASS]
, [LAST_NM]
, [FIRST_NM]
, [MIDDLE_INIT]
, [EMAIL_ADDRESS]
, [EMP_JOB_DESC]
, [BUSINESS_UNIT_CD]
, [BUSINESS_UNIT_NM]
, [BUSINESS_SEGMENT]
, [SUPERVISOR_ID]
, [EMP_FULL_NM]
, [MANAGER_NAME]
, [SUPERVISOR_NAME]
, [SUPERVISOR_EMAIL_ADDRESS]
, [MANAGER_EMAIL_ADDRESS]
, [TEAM]
, [REGION]
, [SUB_REGION]
, [SALES_OFFICE]
, [SALES_GROUP]
, [EMPLOYEE_STATUS]
, [SURVEY_GROUP]
, [SURVEY_APPLICABLE]
, [REGION_CSSC]
, [SALES_ORG]
, [SALES_OFFICE_MULTIPLE]
, [TE_JOINING_DT]
)
SELECT
[A1].[USER_ID]
, [A1].[USER_TYPE_NM]
, [A1].[USER_CLASS]
, [A1].[LAST_NM]
, [A1].[FIRST_NM]
, [A1].[MIDDLE_INIT]
, [A1].[EMAIL_ADDRESS]
, [A1].[EMP_JOB_DESC]
, [A1].[BUSINESS_UNIT_CD]
, [A1].[BUSINESS_UNIT_NM]
, [A1].[BUSINESS_SEGMENT]
, [A1].[SUPERVISOR_ID]
, [A1].[EMP_FULL_NM]
, [D].[EMP_FULL_NM] AS [Manager_Name]
, [C].[EMP_FULL_NM] AS [Supervisor_name]
, [C].[EMAIL_ADDRESS] AS [Supr_Email_AD]
, [D].[EMAIL_ADDRESS] AS [Mangaer_Email_Ad]
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, NULL
, [A1].[SERVICE_CREDIT_DT]
FROM
(
SELECT
[A].[USER_ID]
, [A].[USER_TYPE_NM]
, [A].[USER_CLASS]
, [A].[LAST_NM]
, [A].[FIRST_NM]
, [A].[MIDDLE_INIT]
, [A].[EMAIL_ADDRESS]
, [A].[EMP_JOB_DESC]
, [A].[BUSINESS_UNIT_CD]
, [A].[BUSINESS_UNIT_NM]
, [A].[BUSINESS_SEGMENT]
, [A].[SUPERVISOR_ID]
, [A].[EMP_FULL_NM]
, [A].[SERVICE_CREDIT_DT]
FROM [dbo].[Active_Directory] [A]
LEFT OUTER JOIN [dbo].[Active_Directory_COE] [B]
ON [A].[USER_ID] = [B].[USER_ID]
WHERE [B].[USER_ID] IS NULL
) [A1]
INNER JOIN [dbo].[Active_Directory] [C]
ON [C].[USER_ID] = [A1].[SUPERVISOR_ID]
INNER JOIN [dbo].[Active_Directory] [D]
ON [C].[SUPERVISOR_ID] = [D].[USER_ID];