I selected the workstation, type of installation and 5.2, automatically, changed the partition table and moved the previously created ext2 and linux-swap partitions to the end of the drive, rearranging the partition table and making them three partitions, boot (ext2), swap (linux-swap) and / (ext2). Quite interesting, but VERY DANGEROUS, since it messed up the partition table, not taking into account my other operating systems, and disabling NT4 (installed in another partition). Shouldn't I have been warned before the changes took place?
There are notes in the Red Hat Installation Manual that this will be the behaviour if you choose Workstation Install. For the most complete control over the install, you need to choose 'custom.' Keeping a machine dual-bootable requires 'custom' installation and a bit more knowledge.