I've made a design table with the length of an extrusion being the property being modified. I have made some configuration and concatenated the pn into the configuration name into the name column. However when  I attempt to edit a part in the assembly (right click configure part/assembly enter in new length) the part is made but has a "0" for the configuration name because it is creating the new part in the first unused row. If I drag my formulas to concatenate into unused rows (ie rows without a value for length yet) solidworks wont put the newly created lengths in that "used" row. Thanks for any tips.