When you're moving to another string, what do you do when there's a slide but no note to slide from?

Like for example:

slide from any note on the same string to the note written.

get what i mean?
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It usually just starts from whatever fret is easiest to reach in a particular position.
Yeah, just slide up to the fret- you have to use your own ear a bit, just do whatever sounds right or is reasonable to play
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It means to slide up from anywhere, generally I'd think an open string.
Listen to the song to understand the slide is the easiest way I'd imagine.
Slide into the note from any lower fret on the same string (not an open string). Could be one fret or a dozen. I think most important is to land on the target note with the right timing.
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