If number only appears once, bring back what it says in this column

[Loupiee]

Hi,

I am starting to pull my hairs out with this! I have all the data on the 'Summary' sheet. On sheet 1 in column B ("From"), I need it to match the number to the number on the 'Summary' sheet, and if it says "Originates" in column C, to bring back column A. I managed to do an IF statement but it brings back errors randomly and I could really do with this in VBA.

Once the above is done, I need a similar thing for column C on 'Sheet 1' except this time it's if column C on the 'Summary' sheet says "Terminates". But there's also a caveat here... if the number only occurs once in the data, and if it says "Originates" to bring back the name.

Hopefully this makes sense...