Step 1:

• Create csv file with only 'sku' and 'qty'.

Download sample import csv file

Only create header with 'sku' and 'qty', do not add any other field in header with empty value, else existing data will be replace with empty value.

Step 2:

• Go to Products > Search Products

Step 3:

• Click on 'Import' > 'Product'

Step 4:

• Select 'Ricemill (CSV)' format
• click on 'Overwrite existing item data'
• upload the csv file create in step 1 and click 'Upload'