Previous work experience question in DS160

Hi, have a question on ds160.

1 of my previous employer(XX) has merged with another company (YY).

The thing is I have worked for (YY) also in the ppast, before working for (XX).

In DS 160 under previous employers, can I combine both XX and YY and put it as 1 continuous employment as (YY)?

I worked on OPT for these companies not on H1.

The reason I am asking this is, they ask for previous employers contact, and only (YY) is active so have this doubt.

Can someone please answer, have my stamping scheduled in 2 weeks.