How can I set up different package sizes for shipping calculations?

We have both brick and mortar and online as well. We are not open to regular retail, but locals can pick up orders. This has turned into a logistical nightmare. I won’t be renewing with Shopify after our year is up. Maybe we just have too many things going on for Shopify to cover, but if I increase our prices to accommodate for “free shipping” on larger boxes, there is no easy way to discount that for locals. I put in a discount code for local pick-up, but really anybody could use it if they tried. I haven’t even set up the POS or connected to Quickbooks yet as it seems like just one more disaster waiting to happen. As for shipping, all I could come up with is a mid-size box for the default and include shipping on larger items. We’ll lose some shipping across the country but win some in states closer to us.

I think the original post is so old that Dirk checked out or is no longer around. Seems no one @Shopify_77 is paying attention either. Maybe we need to start a newer thread?