Hi Priya,
When a records management action is taken on a record folder, such as setting an event date, the action is applied to the record folder and all of its contents. This means that the event date will be reflected in all of the documents beneath the record folder without requiring the use of workflow.
In Transparent Records Management all original copies of records are kept in records folders and access to them is provided in other areas of the system using shortcuts. Because the originals are still kept in the record series, any records management action will be taken on all the selected records, even if pointers to them exist elsewhere in the repository.
From your question I am not entirely clear on what you are envisioning. Let's take the following example, with a record series with an event type cutoff. This record series contains three record folders.

Are you asking how to make it so that when you set the event for Test3 the same date is also set for the record folders Test2 and Test? If so, that is not how record folders are designed. Content that should have the same event date should be grouped under the same record folder, allowing you to take action on that group of content as a whole without necessarily impacting the other record folders in that record series. If you happen to come across an exception where multiple record folders have the same event date then you can multi-select the folders and set their event date together, but this is often the exception and not the norm.