Subsea Pipeline End Expansion Calculation

Dear Expert,
Now i'm work with 250 km subsea pipeline project. In the middle of pipeline, there are one piggable wye (wye tie-in). The wye is put in wye protection frame and the elevation between wye and seabed is 1.5 m. So i use a goose neck to connect between pipeline and wye.
when calculating end expansion for this project, i confuse between two method:
1) Consider pipeline free end at Central process platform (CPP) and land fall point (LFP), ignore the discontinue by wye
2) Separate pipeline into two section: section 1: from CPP to wye, section 2: from wye to LFP.

If i calculating end expansion with method 2, i have to make expansion spool before and after wye. However, i've refer some similar project and see that, they ignore the wye and don't make the expansion spool at wye.

Could you give me some advice in this problem?

Thanks.

Steven