EasyEDA does not support true hierarchical designs but it does support multi-sheet designs.

You can put several schematics in one project with connections between made by NetLabels/netPorts. All nets in EasyEDA are global so if you create a netlabel DATA0 in sheet A and then create a netlabel DATA0 in sheet B, when sheet A and sheet B are in the same project, they will be connected.

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Multi-sheet designs(equivalent to a circuit spread over several pieces of paper), all schematics under the same project will be merged into one when be converted to PCB connecting in Netlabel, Netflag, Netport.

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You can click the Sheet tabs on the left-down corner to switch the Sheets, and right-click the sheet tab you can “Save as”, check “Histories record”, “Move Forward/Backward”,”Rename” and “Delete” the sheet.
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If you want to arrangement the sheets order, you click the menu of the sheet icon: Move Forward/Move Backward.

EasyEDA support global unique prefixes, when you place components in different sheet, the editor will auto annotate the prefix. If you save as a sheet to another project, please make all of the prefixes unique, if the Sheet A has a R1, and the Sheet B has a R1, then you will get a Prefix Conflict Error.