Documentation
Apply template
Transfer selected template elements to an existing RDLC layout.
Apply template
Transfers selected RDLC template elements such as page settings, report title, company name, date and time, page numbers, user, filters and tablix headers. Select the elements individually; the target report's business content remains intact.

Tablix header formatting can be transferred too. This is particularly useful when adapting older or manually created layouts to a common template.