There are two ways to easily enable / disable products in bulk in Magento 1.
The first is to go to CATALOG > PRODUCTS, mark off on the left hand side which products you want to disable, then on the actions dropdown (top right of the table) check on ‘change status’ and then a new dropdown will appear – status – which you need to set to ENABLED or DISABLED – depending whether you want to enable or disable your products.
For more than just a few select products, it’s much better to use the CSV import option. Prepare a csv file with two columns headed by sku and status (please note – case sensitive).
Enter the SKU on one cell and next to it in the next cell (same row) enter 1 for ENABLED or 2 for DISABLED. Once you import the csv file, any sku’s marked with 1 or 2 will be enabled/disabled respectively.
Now navigate to SYSTEM > IMPORT / EXPORT > FAST BULK PRODUCT IMPORT > IMPORT PROFILES and select
Browse for your prepared CSV file, select it, ensuring there are no errors, and ‘RUN PROFILE’.