Here are 2 workflows that contain the node VHS_DuplicateLatents:

1.

Size: 13687 bytes

URL: https://github.com/xingren23/ComfyUI-for-ComfyFlowApp/blob/c0305dc8217e8fc1c12accda14b21ba37b87f6ae/workflow/custom_nodes/ComfyUI_Noise/variations_example.json

2.

Size: 51351 bytes

URL: https://github.com/kijai/ComfyUI-DiffusionLight/blob/e7cd8951f0ef74f80e54d4234df73321538548da/examples/diffusion_light_test_workflow.json