Your question appears to relate to AS/400 Printer file or RPG O specs.
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SPACEB will advance the printer the number of lines requested
if SPACEB(2) would advance the paper two lines before printing the record or field.
SKIPB will advance to a particular line on the printed page.
SKIPB(15) will advance to the 15th line of the page, however, if it’s already on the 16th line then the skip will advance to the 15th line of the next page.
SKIP is typically used to move to the top of a new page or the top of a new section of a page.
if yous SPACEB(2) printed something on line 15
and then SKIP(15) was issued, the next items printed would also be on line 15.