Handling multiple advertising accounts efficiently within a single interface
Good Morning Kirti
Thank you for your question. Here at Bing we have some great resources for agencies.
Here is the article on how to become an agency in Bing Getting started as an agency with Bing Ads
Linking with clients is easy and you can choose whether you are the Bill to or the client is. For more Agency resources please visit our Agency Page at Resources for agency partners
If you have never been approved for Monthly invoicing, we do have a process to review your company for approval. Please contact your local support for application. More information about Invoice Billing can be found at What you need to know about monthly invoice billing