Please read below.
THIS ACTUALLY WORKED FOR ME TODAY IN CHANGING “THE HANDLING TIMES” ON ALL MY LISTINGS IN A BATCH FILE, IN A MATTER OF MINUTES.

Apr 25, 2020 03:39 PM

Hello from Amazon Selling Partner Support,

We understand that you would like change handling time.

We would be glad to inform you that you can update your suggested handling time in bulk through feed upload (Price and Quantity template).

PRICE AND QUANTITY TEMPLATE-

1. Download template
   https://s3.amazonaws.com/seller-templates/ff/na/us/Flat.File.PriceInventory.us.xls

2. As price and quantity template has only seven columns which are SKU, price, minimum-seller-allowed-price, maximum-seller-allowed-price, quantity, handling-time and fulfillment-channel.

Fill only 2 columns-

SKU
Quantity
Handling Time

3. Please save your file in "Text (Tab delimited )’ Format and upload steps are as follows:

a. On the Inventory link, click "Add Products via Upload".
b. Click on "Check and Upload your Inventory File"
c. Direct go to Step 2- Upload File.
d. In the Type of File to Upload section, use the drop-down to select your File Type.
e. In the drop-down menu, please choose "Price and quantity file" type.
f. Click on "Browse" to select your inventory file that you want to upload
g. After you select your file, click Upload now.
h. When you upload your file, a status box confirms that your file has been received.

To help us continually improve, we ask that you take a moment to complete our survey below to tell us about your experience with this specific interaction.

Thank you!

Thank you for selling with Amazon,

Sandeep Kumar G.
Amazon.com Seller Support