All you need to do is to click on the block to get the Block-Modify ribbon bar. Simply click on the button that has the +- on it. This is Add or Remove Blocks. The table will update accordingly. To add new balloons that reference the block table, run the Balloon command. Press the buttons for 'Link to Parts List', 'Item Number', and 'Item Count' if needed. In this case 'Link to Parts List' means link to block table.
Thanks for the reply Using the drafting feature in the 3D program not the 2D drafting package. Was in active sheet mode not user selection If I click on a block I get the block edit definition dialog If I click on the block table I get the add remove/auto balloon/properties edit definition dialog Click add remove, existing blocks highlighted, select new blocks then click auto balloon then accept, works ok. However if all occurrences of selected blocks is selected in place of one occurrence of each block in table properties it balloons everything again and again each time you add new blocks, doesn’t recognised already ballooned blocks.