When formatting an Excel document you can make each tab in source document its own section. This provides clarity and context for the SMEs responding to the RFP. In the image below, each section has a non-descript name.
If you want to create sections based on the worksheet names (tabs) and you also have sections within the worksheet, simply mark the sections in the worksheet as "Subsections."
Responsive will identify each of these tabs as the sections and the subsections will be listed below each section.