I recently submitted a paper to an Elsevier Journal (Biomedical Signal Processing and Control), in the revision stage they propose to me to send a part of my work as MethodX article https://www.journals.elsevier.com/methodsx alongside my revised research article and if my paper accepted for publication the MethodX article will automatically be transferred to MethodX where will be reviewed and published as a separate article.
Now, If I prepared the MethodX article, should I change the original text, rewrite (not be guilty of plagiarism) or just take parts from the original article and format a MethodX article?