Thank you for contacting Syncfusion support.
Essential DocIO supports to maintain (Preserve) existing repeating section content control in the Word document. Currently DocIO doesn’t provide support for creating repeating section content control and accessing their properties programmatically. We have considered this scenario as a content control enhancement work and logged a feature request in our database. We will implement this feature in any of our upcoming releases. The feature implementation would also greatly depend on the factors such as product design, code compatibility and complexity. We request you to visit our website periodically for feature related updates.
Could you please provide us more details about your end requirement along with the input word document and expected output document. This will be more helpful to check the feasibility to achieve your requirement in alternate way.