So how do you it?

Because i get no money from stores (i assigned people there), nor do i get any resources

Bottlecaps will show up in your workstation. Excess food and water will also show up there periodically.

And pre-war money. Weightless, sells about 4 caps per, and they scavenge them up at a fairly regular rate.

i went to an other settlement and sleept for 2 days and plus the time back and nothing in the workstation

I heard the stores in general are a terrible way to make caps, apparently it depends on the amount of idle settlers you have in the settlement; and even somehow breaking the settler limit won't earn you much income. You're better off selling the produce of massive water purifiers, or farming and picking all the fruit and selling those.

Building giant water purification plants produces a lot of purified water...great to sell. I get 100-200 caps everytime I check Sanctuary Hills from the stores I have...I seem to have difficulty keeping settlers assigned though...they always wander off.