You can take the subway from Tianhe Bus Terminal to Taixing Commercial Building, No.599 Guangzhou Avenue Central, Yuexiu District, Guangzhou. The specific routes are as follows:

1. Take Metro Line 3 (north extension) from Tianhe Bus Terminal, and get off at Tiyu West Road Station.

2. Transfer to Metro Line 1 at Tiyu West Road Station and get off at ximenkou station.

3. Exit from ximenkou station, walk to Ximenkou Bus Station, take Bus B5, and get off at Guangzhou Avenue Middle Road Station.

4. Go along the middle intersection of Guangzhou Avenue for about 1 meters, and you can reach Taixing Commercial Building.

The above routes are for reference only. Please adjust the specific boarding mode according to the actual situation and local traffic conditions.