You can easily fill all links in such one-to-many relationship just by copypasting whole column of values to the link field from ‘wide’ side.
Also, you can easily maintain linked relationship by automation, for example, setting trigger ‘when record matches condition’(link is empty).
In your case, do ‘find records’ in Table 2 and put the result… i’ll show
But sometimes you need it for link, where both values ‘inside’ the table
You can do it by script, by automation or manually through third table
automation is the easier way. put array of results to a field that awaiting array.