Yes but it's a bit.. painful to do it.
You need charisma 6, level 14, and 2 points in the load leader perk (in the chrisma tree).
You can then link settlements, by selecting a settler, and using the link button. This now pools resources between those two settlements.
I tell you one thing, and I was going to leave this until the end when I put other thoughts down - I absolutely hate the new settlement system, for some unknown reason they didn't think it was worth showing you when a settler was assigned to something or not, impossible to tell!
You only need the first level of the perk to link your materials.