I'm not exactly sure what you are trying to accomplish. Could you post a screenshot of your artwork along with a more detailed explanation. Illustrator is also slowly retiring "Save for Web (Legacy)". You might want to try… File > Export > Export for Screens This is a great option for exporting out multiple artboards at multiple sizes and formats in one shot. Note there are two tabs in the popup so be sure to click on Artboards if this is what you want. Again I'm not exactly sure what you are trying to do but you could, for example, put each of your tables on it's own artboard and then quickly output all of them simultaneously.
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