Yatha samkalpitah is explained by the commentator as yo yena sreyastena bhavitastasya tadeva sreyah.
Yogajitatmakam is yogena jito niruddha atma chittam yena tam, as explained by the commentator.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "yena" in a variety of sentences. We hope that you will now be able to make sentences using this word.