1. Prepare the data to import.
2. Delete existing data to avoid mixing existing data with data to be imported.
File >> Open data folder >> history >> Your MetaTrader 4 server name >>
Delete the file with the extension ".hst" that contains the name of the currency pair you want to import
* If you import without deleting, only the imported range will be overwritten.
3. Select "Tools" - "History Center"

4. Select the relevant currency pair and time frame
5. Click "Import"

6. Click "Browse" and select 1 external data
7. Import completed when data is displayed


If it is not reflected on the chart, please restart MT4.