The registered tenderer replied that what you are doing should be bidding for goods. You don't know what a tender letter is, but there are generally only two kinds. If public bidding is adopted, it shall be published on the website or newspaper designated by the state. If it is an invitation to bid, then you have to issue an "invitation to bid", which is the first step. Then the next step is to make and sell the bidding documents, and the bidders buy and make the bidding documents; Bidding, bid opening, bid evaluation, issuing bid-winning notice and announcement, and finally signing the contract are the whole bidding process.
The materials needed in the bidding process mainly include: tender announcement, tender documents and bid evaluation report. The bid evaluation report shall include: manufacturer's sign-in form, bid opening record form, judge's sign-in form, judge's score form, recommendation conclusion form and bid-winning notice.