Hey, when we are applying for masters in Canada are we suppose to submit the transcripts of all the semesters or they give more relevance to last 2 semesters?

Depending on the university and the department they consider the last two or four semesters mainly and balance holistically. We wouldn't know for many universities unless it's explicitly mentioned on their department website. See more

For all the semesters you have to submit. Irrespective of the Bachelor's.

Yes, all semesters marks memorandum if you have completed the engineering, or till the semester available. See more