The best answer is probably to use an imposition program or the imposition facility within your printer driver. Both are likely to have the correct facilities to create booklets.
A possible alternative is to merge print to a new temporary document. I've not tried this, but you may then be able to redefine the temporary document as a booklet and/or create a booklet imposition for it.
If the imposition works correctly, you should not need to split the document into groups of 8 it should be handled automatically. But if you do need to do that, you can put page ranges such as 1-8 or 9-16in the print dialogue.
Whenever I print booklets, I create a normal A5 document in single page mode, make a PDF and send it to my printing company for imposition. My own printers do not print edge to edge, so they aren't suitable for booklets -- and in consequence I've not experimented much with the booklet facilities.
Imposition facilities exist within CorelDraw and I'm sure it could be made to do your job with a little bit of effort. But to want to print 8 pages at a time, I presume you're doing something like printing four A5 pages on each side of SRA3 paper, and then folding them both horizontally and vertically. Is that correct?
Henrik said:When I am printing without merge, there is no problem.
So, have you tried merging to a temporary document and printing from that?
If the temporary document does not print correctly, then we can presumably compare the characteristics of the temporary document and see what is different.
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With the booklet imposition, I cannot set anything other than 0 pages per group. But it seems to me that if you then select a page range of either 1-8 or 9-16, etc, you get the correct pagination.