Greetings from Amazon Seller Support,

Thank you for writing back to us.

I have reviewed our previous correspondence with you, and I offer my sincere apologies for any misunderstandings thus far. 

I understand that you would like to know how to update product listing price sale price and sale date using mobile App.

I'm sorry as per our policy, currently this option is not available on Amazon. If this option is available in future we will let you know on your seller central home page.

I will take this suggestion as a feedback and will forward your comments and feedback to the appropriate department for consideration. Your feedback is valuable to us and we welcome suggestions from our sellers. 

Thank you for taking the time to contact us.

Once again please accept our sincere apologies for the inconvenience caused to you.

We want you to be successful on Amazon.

Have a great day!

Please let us know how we did.