请问The software that I mainly used when working is office.的语法

The software that I mainly used when working is office.
在The software that I mainly used when working 中,that I mainly used when working 是定语从句修饰The software,
when(I am) working做定语从句中的时间状语从句
此句翻译为：我在工作中主要使用的软件是office软件.