I can't answer your question, but I have seen several job postings on usajobs that require you to include the number of hours worked for each job.

Can you list the position as one and then within the body of the responsibilities section, separate it out? LWOP doesn't mean you were unemployed, so you don't have to explain in if you don't present it as an issue. I would work with the formatting to keep it listed as one, coherent job, since that is factually accurate, even if you had a change up in responsibilities.

For comparison's sake, I've changed up portfolios as well in my current job - big changes after returning from maternity leave, but I don't list it as two separate jobs, and I don't note the period of my maternity leave.

I took leave without pay to care for my ailing father for almost 1 year. My office was kind enough to hold my job for me.

When I returned I was assigned to another team that had a need and much different responsibilities same job category (fine by me - nice change of pace). I am putting down my time in this office as two different jobs (lateral move). For the position I held prior to returning, do I need to use the end when I left for leave or when I came back at which point I was moved to a new position. I don't mind explaining my absence, but I am not sure I want to do so in a resume, especially knowing I could have returned whenever I wanted, but it also looks like I did the first job a lot longer than I did.

I am noting the current position started when I returned.

Hopefully I am over thinking this.