When it comes to MailMerge from MS Word, there is no technical approach to paste the if field and expect it to work. In the scope of the HTML, where is the data base table, which to coordinate with?
Generally, in HTML this can be called binding to data base, and the approach to build it like in MS Word is rather a custom solution. There are no built-in options to achieve that.
Recently, a new code library item was created to demonstrate the creation of a similar MailMerge functionality. You can follow it via this link - MailMerge with RadEditor
. Although, if statement fields are not illustrated, you should be able to follow the example attached and further extend it up to the exact requirements.
Note that using the custom solution suggested will not enable users to paste MailMerge from MS Word directly. With this solution the data table is still not passed and in a web application there is no technique available to properly get it.
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