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any recommendations on splitting an existing stack into two separate ones ?

The way I've done it before is:

1. Create the new stack
2. Export the first stack and import it into the second stack
3. For each stack, get a list of URNs that you want to delete
4. Run `pulumi state delete &lt;URN&gt;` for each URN in each stack
5. Done
Your mileage may vary, but I find this to be the easiest. Building a new stack from scratch and importing resources is just way too time consuming. The old stack already has all the information

To get the URNs, `jq` or a carefully crafted `grep` do the job.

Or even just output to a file and edit by hand, doesn't really matter as long as you feel comfortable with it.

Save a copy of the old stack just in case :slightly_smiling_face:

The interesting bit is that you don't need to touch any resource during this operation. After you split the stacks and do `pulumi up` on both of them, nothing should change. If that's the case, success! If you think you screwed up, load the backup and try again.