How do I create a Bulk Upload file in the Vendor Portal site?

Question

Yandex Market Language

You need to bulk upload goods on the "supplier portal" website.
All that is from the information.
BULK LOADING SYSTEM INFORMATION
The XSD schema for bulk loading of offers can be found at the link
The offerImportPacket type is used.
It is necessary that there are several items of goods in one offer.
There are goods:
No. - Item name - Quantity - Price - Amount
1. - Item 1 - 2 - 20 - 40
2. - Item 2 - 2 - 20 - 40
3. - Delivery - 1 - 1 - 1
4. - Assembly - 1-1-1
...
How to combine it and make it in xml / xsd format so that it can be downloaded and looked like one position on the site.