Deletion of excel lines starting from specific text

well, i had put some query few time back, but did'nt get usefull response. All i need to know that is there any way through which we can delete those excel rows which starts from some special text like: Molecular weight,G+C content, Length etc........... Actually i have an excel file which looks something like below......and i need the addition or sum of the data under Number column




DNA molecule: Contig1
Length = 10221 base pairs
Molecular Weight = 3117106.00 Daltons, single stranded
Molecular Weight = 6206947.00 Daltons, double stranded
G+C content = 45.48
A+T content = 52.90

Nucleotide Number Mol
A 3044 29.78
C 2452 23.99
G 2196 21.49
T 2363 23.12
N 166 1.62



DNA molecule: Contig2
Length = 6218 base pairs
Molecular Weight = 1883258.00 Daltons, single stranded
Molecular Weight = 3774966.00 Daltons, double stranded
G+C content = 43.42
A+T content = 52.91

Nucleotide Number Mol
A 1652 26.57
C 1240 19.94
G 1460 23.48
T 1638 26.34
N 228 3.67

ok, so for ur reference i m attaching the file, if u r able to understand the problem then reply me....

seems like u had posted some one elses query, as there is data in row 6.

heyy big big sorry, actually i had uploaded the wrong file earlier from my desktop. Just bcoz of hurry couldnt uploaded the accurate file. So i m now uploading the correct one..
Really sorry for the previous one.....