YOU SAID:

I was walking up The front porch steps

INTO JAPANESE

私は歩いていたフロントポーチの階段

BACK INTO ENGLISH

I was walking on the front porch stairs

INTO JAPANESE

私は正面玄関の階段を歩いていた

BACK INTO ENGLISH

I was walking on the front entrance stairs

INTO JAPANESE

正面玄関階段を歩いていた

BACK INTO ENGLISH

I was walking on the front entrance stairs