Understanding Society User Support

Hi,
I am running analysis (logit) on a subsample of UKHLS - wave 6 only, people under the age of 30.

I am using the following weights:
svyset f_psu [pweight=f_indinui_xw], strata (f_strata) singleunit(centered)

I wanted to check that this was the correct approach? I am unsure whether the weights should be used in the same way for a subsample of UKHLS as if you were analysing the full sample.

Thanks
AM