Postage policy

I wish to sell an item which is pickup only.  I have 2 active selling items which I created a default postage policy for and show postal $ costs.  I do not want to amend these two postage poliocy items.

How do I indicate local pickup for a new item I wish to list please ??(actually I have listed it but it is showing $20 postage which is incorrect).  The $20 postage is from my postage default policy for the other two active items.

I am not choosing default postage policy.

I thought I could create another postage policy for pickup only.

Many thanks.