The plate index code set by each software is different, so there is no fixed code.

Then, the simplest thing is to directly input the first letter of Chinese Pinyin.

(1) For example, access software, look up "land (d) production (c) disk index (z) number (s)", type the letter dczs, and press enter.

(2) For example, access the software, find "house (f), land (d) and real estate (c)", type the letter FDC, use the arrow keys to find it, and press enter.

(3) For example, for Tongda software, enter "15" to find the sector index you need, including "all sectors", "industry sectors" and ... This is the simplest method.

The picture shows Tongxin Da software interface.