Facebook Ads Manager Reorganization

I require assistance in streamlining my Facebook Ads Manager. Presently, I have two ad accounts - one associated with my business's Facebook profile and another one created via Instagram. This setup is leading to confusion with billing settings and multiple bills being issued at different times.

Your task will involve:
- Merging both ad accounts into one cohesive unit to ensure all ads are run from the same account and billed together.
- Simplifying my account management to make future ad setup less chaotic.
- Make sure the billing settings are set to preferred options.

While I have prior experience with this process from another business, I'm not particularly adept at navigating Facebook Ads Manager. I'm seeking someone with expertise in this platform to expedite the setup.