Installing RHEL 7 using LVM on sdb instead of sdb1

I'm trying to install RHEL 7(.5) in VMware with sda for /boot and everything else under LVM on sdb.
The old version of the VM (RHEL 6.9) was installed using LVM directly on the drive (sdb) instead of using the partition table (sdb1)
The admin explained this was done for ease of expansion of the drive, increase drive size in VMware and then directly in LVM, no need to have to expand the partition table.

Problem is, the RHEL 7 installer doesn't let me directly work with the partition table, it decides how to do that.(using sdb1, of course)
When I tried to drop to the CLI and manually create the PV and VG, the installer decided this was from some existing environment and didn't want to go anywhere near it, just letting me delete the whole thing.

Is there a way to do my own partitioning? (or lack of)