My style coming from less of a sas background is to keep everything to one main sas program, but use the nodes, arrows, icons, etc. the 'filter and query' stuff for verification and exploration. So that stuff I leave in there for future reference, but always the main program on top.
And I do use flows for import/export type stuff. And I love to leave notes.
I separate out to different tabs when there is old code or experimental code, and that way all the exploratory and verification stuff is kept together with the relevant data.
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