Insert an item to a quotation to amend it#2991

When wanting to add an item into an already existing quotation, I cannot add it in to the section, I need to redo the entire quote instead of just been able to insert an extra item on the quote under a certain section.
Eg. Wedding reception (heading)
Table settings (sub-heading)
Here all the crockery, cutlery, glassware etc would be listed, but if the client wants to add red wine glasses, it cannot be inserted, the whole quote needs to be redone.

Is it possible to include this feature please 🙏🏻