SQL Import text files
That shouldn't really be done on a single table, it will cause you all sorts of grief. Do it over two tables. Have your first table however you want, but without the "graph" values (time and load). Instead have simply a "graph_id" value or something similar. e.g. (based on your example):

------------------------
|Heading         |     |
|Test No#        |     |
|Test Date       |     |
|Test Time       |     |
|Maximum Load    |     |
|Maximum Strength|     |
|graph_id        |     |
|Checksum        |     |


Then have another table that stores your graph details (time and load):

------------------------
|graph_id        |     |
|time            |     |
|load            |     |


Access the data via a simple join.