Seems like you need a Formula field.

Use a formula like this:

{Column D} & '/' & {Column E}

or just

{Column D} & {Column E}

if the forward slash is already accounted for in your slug field.

Thx you so much for your prompt reply.

I have just tried, and I have an error.

I then try to do a realy basic formula, and I still have the same message.

I put in copy the screen and the formula.

Can you help ?

Well apparently none of your columns are actually named ‘Column D’, so there’s your problem lol

When inputting content from another cell, put the name of the column in brackets (i.e. {Notes}). When just inputting text, put it in quotes (i.e. "this is some text")

Wooh impressive how reactive, you are.

No it’s not the problem, see below… i select the name of the column in the drop down menu to avoir mistake while typing.

As said before, if its part of the name of a column then it goes in brackets. If its text you want to appear in the output put it in quotes.

Either delete the word column or put it in quotes.