MOHAMMED,Creating a design table is easy and you may already be doing so when you link sketch dimensions to different configurations. However it is best to structure these in a grouped fashion that are easily managed so they do not cause conflicts, undesired consequences and get out of manageable control. I use equation driven measurements quite a bit to maintain symmetry (good working knowledge of MS Excel equations & functions extremely helpful in managing the tables). Another trick I do is to have a template sketch sheet with the table driven values which then link other sketch item properties to it (example keep template sketch visible when drawing sketches for features and relate properties : equal to, coincident,colinear, etc) If you download my model ( https://grabcad.com/library/barrel-cooperage-19th-century-english-wet-cask-1 ) you will see what I mean about a linked trace template & equation driven measurements. It is just a matter of reading through the various help files and reference books to get a feel for it. took me a while but now extensively have multi configuration files. Hope this helps