Hi

You can attach host device directly from virtual machines tab -> select VM -> host devices sub tab -> "add device" button.

But first you need to verify your BIOS is supporting intel VT-d or AMD vi.

And you also need to activate it in the kernel. The next link describes how to do it:
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Virtualization_Deployment_and_Administration_Guide/chap-Guest_virtual_machine_device_configuration.html#sect-Guest_virtual_machine_device_configuration-PCI_devices

note: Instead of adding "intel_iommu=pt" in the grub cmdline, add "intel_iommu=on" or "amd_iommu=on".

Thank you  Nsim and Martin.  I'll give that  a try.