Published manuscript to handbook or manual I am presently developing a handbook/manual based on our published methods in a not-open access journal. The content of the manual is different (i.e., format and structure) from the published version and we made a modification, for example, we structured our manual to a "recipe style" so it's easy to use and follow by users. We cited the original paper and we borrowed and cited some of the figures (and some new ones). I am wondering would it be against the journal policy if I do this? Or any advice about how I will handle this. We also plan to publish the manual through an organisation.
would it be against the journal policy if I do this?


It is not against journal policy for


  a handbook/manual [to be] based on...published methods in a...journal. 


Indeed, anyone is free to write a handbook/manual based upon published materials. (Such a handbook/manual should not plagiarise, of course, and the OP has noted that the handbook/manual differs in content, format, structure, and style. Furthermore, the OP notes that the original sources have been cited.) Regarding, 


  we borrowed and cited some of the figures


You need to check this is permissible, it has been answered elsewhere on this site.

There may be other concerns, but the question doesn't raise them.

TL;DR: Write your handbook/manual as-if you didn't write the original sources.