In Google Docs you can easily create and modify lists with multiple levels in your document. You can format your lists with bullets, numbers, or even make them alphabetical. Let's take a look at the process.
Create a multi-level list
Start a browser, go to your Google Docs homepage and open a new document.
It is effortless to make a list with multiple levels in Google Documents. All you have to do is type on a line to start your list, press Enter after the first item to start a new line, type the next item in your list, and so on. When you have typed all items on your list, mark all lines.
Then click Format> Bullets and Numbering> Numbered List, and then choose a style from the list.
For this manual we use a numbered list. If you prefer a "Bulleted List", choose it.
Your list is formatted in the style that you have chosen.
While this is a one-level list, the process of creating a multi-level list in Documents is not much different. When you relegate and promote items, that becomes a real multilevel list.
Downgrade and promote lines in your multilevel list
Downgrading a line indents an item to a lower list level below the previous item and promotes an item doing the opposite.
To downgrade an item, place your cursor at the beginning of the line.
Next, press Tab to send the item to the bottom list level.
If you want to downgrade an item more than once per line, keep pressing tab. You can downgrade an item up to eight times. In our example, we have downgraded the third line in our list twice.
Repeat the steps until you are satisfied with your list on multiple levels.
If you want to promote a line (one level higher), you can use a shortcut key. Place the cursor at the beginning of the line and then press Shift + Tab.
 You can use this method on multiple lines at the same time. First mark the lines in the list that you want to promote.
Then press Tab or Shift + Tab to downgrade or promote the list items. 
Changing the size of a multi-level list
If you want to change the basic layout of your multi-level list, it's easy! If you initially chose a numbered list, but decide that you want a bulleted list, this is no problem! It only takes a few seconds to switch from one format to another.
Place the cursor anywhere in the list, click the Bulleted List icon (or Numbered list), and choose a style from the drop-down menu. 
Similarly, the entire list changes to the new style that you have selected.
Adjusting a multi-level list
Although the level of customization in Google Docs pales in comparison to Microsoft Word, you can use colors and unique bullets to personalize your multi-level lists. .
If you want to add some color, mark a line in your multi-level list.
Then click the Text Color icon on the toolbar and choose a color from the palette.
Repeat this step for each line that you want to make more vivid.
You can also customize any bullet point in your list with a symbol, a special character, emoji, or anything else that is available in the Google Docs special character list.
RELATED: Inserting symbols in Google Docs & Slides
To do this, double-click the bullet or number you want to change and right-click on it to open the context menu. You can choose from a few options in the context menu or click on "More bullets" to see the full list of special characters.
Click the second drop-down menu to choose a category. There are many of them, so be prepared to spend some time.
Click the third drop-down menu to refine the characters even further.
After choosing the categories, click the character that you want to designate as the new bullet.
An alarm clock is a ridiculous choice for a bullet, but you can choose anything you want.
Repeat this process for each bullet that you want to replace until you are satisfied with your multi-level list.
These custom bullets act as the new style for your list. Every time you promote or relegate an item, it does so with the bullet point of the current level (provided that you have chosen one for that level).
That's all there is!