There are a few ways for this task.
For just copying a column, one could. select the column, which has an 'X' size of 1.5, add 0.75 gap = 2.25, with the column selected, select linear copy tool. type in x = 2.25, y = 0, z = 0, sets = 7 (or whatever).
Before drawing the column, on could just use one smaller rectangle, and one larger rectangle at top left, select them both gives a size of 1.5 (x) and 5.25 (Y). using this information one can set up an array. 1.5 + 0.75 (new gap) = 2.25. 5.25 + 0.75 (new gap) = 6. With them selected, activate array copy. type in x = 2.25, y = -6 (as we want it to go downwards), z = 0, row 6, column 7, leave level at 1. press return key. Just wondered, could you not use rectangles instead of all line.
# Edit## just to add another way (more work), select the column, activate make copy on the inspection bar, click in (tab to) the delta X field, type in 2.25, press return, this makes one copy of the column, repeat as necessary by selecting the new column and re-enter delta X 2.25, turn off Make copy. ## End Edit ##