英语表达：该项目初步选定A和B作为试点

A and B have been /were picked/choosen/selected as preliminary trail spots for this projets./ for a preliminary trail run of this project.

The project initially selected A and B as a pilot

we have temporarily chosen A and B as the testing point of this project.

这里的初步我觉得可以翻译成temporarily （暂定为）