If you already have a drawing that you consider as a standard, you may want to use the blocks from that drawing. The easiest way to manage the blocks is using tool palette. So do we need to open the drawings, drag and drop each block to the palette? No way!

You can use design center and create the palettes just with a few clicks!

1. Open design center, find your file.
2. Expand the (+) sign, right-click on blocks.
3. Click the option CREATE TOOL PALETTES, then the blocks in that file will be in a palette!