I need to create an image from VM ware workstation 16 and used that image in 6.7.
Is there any backward compatablity issue ?
I've reported your thread, it needs to be moved to the Workstation Pro area.
Refer to this article for creating a VM with a custom configuration: https://docs.vmware.com/en/VMware-Workstation-Pro/16.0/com.vmware.ws.using.doc/GUID-BCCF51D0-B76C-43...
And this article for the hardware versions which work across products: https://kb.vmware.com/s/article/1003746
Just make sure to specify during the VM creation that you want a Workstation 6.0 (or 6.5-7.x) compatible one.
I'm assuming you mean ESXi 6.7? When creating a new VM, select Custom, then on the next page select ESXi 6.7 Hardware compatibility level.