I need A custom category of blocks to appear in another panel/div

Nvm found the solution
define your category like so
blockManager.get('my_block').set('category', 'custom_defined_category');
 and then
const blocks = blockManager.getAll();
const filtered = blocks.filter(block => block.get('category') == 'custom_defined_category')
const newBlocksEl = blockManager.render(filtered,{ external: true });
document.getElementById('some-id').appendChild(newBlocksEl);