Drag drop Issue

Bootstrap Studio Help
#1

enter image description here

Im trying to drag and drop a column into new column but cant! What im doing wrong?

#2

I believe you need to put a row in first then you can put the column in that row.

<div class="row">
   <div class="col-md-3">some stuff there
      <div class="row">
         <div class="col-md-3">some more stuff here</div>
      </div>
   </div>
</div>

Saj