"-ㅂ니다" is a polite and formal ending. 가다, 가-ㅂ니다. 갑니다. "습니다" is used when conjugating with a verb stem having last sound of last character, 먹다, 먹-습니다.먹습니다. When using it with '-이다', it is conjugated to '입니다'. 이-ㅂ니다 이다, 이-ㅂ니다. 입니다. The other questions don't have enough information for answering. Please ask question more clearly.

hi, 습니다 and 입니다 has the same meaning but it has difference in the level of honorific. 습니다 has higher level than 입니다. im sorry because i'm still learning too so thats all i can answer for you. i hope it can help. hwaiting! ^^