Hello @YCRE ,
There is not currently a feature to save custom blocks within the email editor, at this time.
If you know how to create emails and blocks from HTML, then I'd advise using the custom code editor for copy-paste functionality of email parts.
Otherwise, if you're using the regular email builder, I'd advise setting up reusable templates with the layouts you want for particular days, events, etc. and then creating emails from those. Or you can make a singular reusable template that has all of your "modules," and you can simply delete the ones you don't need when you copy or create an email from it.
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