How to delete a custom metaData in salesforce which I have added as a component in Managed package?

Hi,

In order to remove components from a Managed Released Package, there are two options:

1. Partners can request to enable "managed component deletion" feature in the packaging org.

NOTE: Although a component is deleted, its Name remains within Salesforce. You can never create another component with the same name. The Deleted Package Components page lists which names can no longer be used.

Also, some components aren't developer-deletable.
If a component can't be deleted using this method, you'll need to follow option 2.

2. Support can change the release version from Managed-Released, to Managed-Beta if certain conditions are met. Be sure to provide support with the following details:

i. Package Version details -  Name, version, etc.
ii. Package version in question and later versions should not be currently installed in any subscriber org (if installed, they need to be uninstalled)
iii. If the package version in question and later versions have patch org created. If you do have any patch org created, please mention that in your case and confirm if it is ok to purge the patch org. (Patch org needs to be purged to revert the package)

NOTE: We can't change a Managed Package to an Unmanaged Package.

A few things to keep in mind

The package will need to go through security review again, once changes are made and new version is released.
Review fee will also apply, please work with your PAM / TE for more details on the fee.
All subsequent released versions will also be reverted to beta, eg, if v1.2 is requested to be reverted to beta and v1.3 & 1.4 were released, all released versions after v1.2 will also be reverted.