Dear Indiguna,
the process in D365/AX is to create an new sales quotation (or even a sales or purchase order) and then pick up the lines from an existing sales quotation using the "copy" and "from all".
Once a sales quitation is confirmed, the copy from all button is locked.

At this form you can select any quotation (regardless the status), select any quotation lines or also from quotation journal or even a sales order. You can also combine multiple SQ or SO into one new sales quotation.
If you use "Copy from all" this was I could also copy items without belonging to a product category hierarchy
Hope this helps.