Using Control key to add a linked symbol
You can use a keyboard command to add linked symbols to a selected symbol. This command lets you control where your symbols are located. For a complete list of keyboard shortcuts, see Using keyboard shortcuts.
1.Select the symbol to which you want to add a linked symbol.
2.Hold down the Control key, then click where you want to place the new symbol.
3.Enter your idea in the new symbol.
Without entering any text, continue to add symbols by selecting a symbol, holding down Control, then clicking where you want the new symbol to appear.