How to implement a Type 3 SCD implemention for a field in a table?

Hi,
I have a existing ssis package. SSIS 2016.

Source is a text file with Employee data. Everyday, the full file will be there in a path.

From there, its loaded into a Stage table as is (truncate and load)

From stage table into main table, there is a stored procedure to load new records into the main table.

There is a stored procedure to update existing records into the main table, if there is any change in the columns. Type 1 SCD (No history maintained and update the changed records with the new value and then update the Record_Modified_Date column with the today's date.

Now, there is a new requirement -  there are two columns in the table - employee_current_location & EMployee_old_location. I have to implement the Type -3 implementation for these two columns.  

Example: For Empoyee ID=100, from the Source -> Employee_location = 'Delhi'
While transforming from stage to main table, the EMployee_Current_location should be 'Delhi' and  Employee_old_Location value is NULL.

Next day, from the source Employee_Location is 'Mumbai', then in the main table, 
EMployee_Current_location ='Mumbai' and EMployee_old_location ='Delhi'

Next day, from the source Employee_Location is 'Calcutta', then in the main table, 
EMployee_Current_location ='Calcutta',  and EMployee_old_location ='Mumbai'

So, basically, only for this field, current and Old value should be captured, using two different columns.

Can anyone help me on how to deal with this?