Each of the XCellRangeMovement methods may be called from any sheet. It makes no
difference. So I believe XCellRangeMovement should be exported from
c.s.s.sheet.SpreadsheetDocument rather than c.s.s.sheet.Spreadsheet.
StarBasic example:
Sub copyTest
REM copy a1:b3 from sheet #0 to sheet #1, using sheet #2
with thiscomponent.getSheets
	srcAddr = .getByIndex(0).getCellRangeByPosition(0,0,1,2).getRangeAddress
	tgtAddr = .getByIndex(1).getCellByPosition(0,0).getCellAddress
	oSh = .getByIndex(2) 'ANY existing sheet will do
end with
oSh.copyRange(tgtAddr,srcAddr)
REM it could/should be: thisComponent.copyRange(tgtAddr,srcAddr) as well
End Sub