How to check multiple values using if condition [duplicate]

Answer 1

Since it makes sense to use dplyr for your second question (see @iod's answer) it is also a good opportunity to use the package's very straightforward case_when() function for the first part.

Records %>% 
    mutate(Status = case_when(Remarks %in% c("ABC", "AAB", "ABB") ~ TRUE,
                              Remarks %in% c("XYZ", "ZZX") ~ FALSE,
                              TRUE ~ NA))

  ID Remarks Value Status
1  1     ABC    10   TRUE
2  1     AAB    12   TRUE
3  1     ZZX    15  FALSE
4  2     XYZ    12  FALSE
5  2     ABB    14   TRUE