Creating a macro to search string in a range of cells and replace while leaving original

Hi all, I am new to this forum. Hope I can get some help on this matter.

So I was given the task to translate some procedure instructions in an Excel file from English to Spanish. These are very simple instructions and in most cases repetitive throughout the document. There are a lot of instances where the instructions are the same except for a #. They are meant to be modified within the cell as the text that appears in the cell will be printed exactly as it appears.There are several instructions in the cell, it is basically a long continuous string in the cell. My idea is to create a macro that can search that range of cells for the instruction, replace it with the Spanish equivalent while leaving the original English instruction in the cell. Any ideas on how can I go and do this on Excel? Any links to other forum threads I can read on ?

Thanks in advance.

JCarlos