add column in a certain range

[Formic Nether]

hello everyone

i am having a little trouble.
i have a set of data, and i want to use vba code to add a column at a certain range.

for example, in the test spreadsheet

45	45	45	45	45	45	45
46	45	45	45	45	45	45
47	45	45	45	45	45	45
48	45	45	45	45	45	45
45	46	47	48	49	50	51
45	45	45	45	45	45	45
45	45	45	45	45	45	45
45	45	45	45	45	45	45

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i would like to add columns only after the column that says 48, from the last 4 rows

thank you for your help