First make sure there are predecessor/successor relationships among the
correct tasks. It is usually considered sinful to place predecessors or
successors on summary level tasks.
What happened when you keyed in dates is that Project created some
additional constraints for you such as "Start No Earlier Than" or "Finish No
Earlier Than". You want all these to be "As Soon As Possible" which is the
default.
Assuming you have correct linking logic, I would insert the column
"Constraint Type" by clicking Insert/Column... select "constraint type"
from the drop down. Click OK.
Click on the top of the "constraint type" column to highlight all the
contents. Then click Edit/Clear/Contents
The inserted column may be hidden by right clicking on the column header and
selecting hide column.
That should set you back to driving the logic with your predecessors.
Since you are a new user, one of the Microsoft Most Valuable Partners (MVP)
in MS Project is Mike Glenn. He wrote some really nice tutorials on the
program. Go to the link below. Once there, click Links and Downloads. On
the left side there will be a link to Mike's Tutorials.
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If this post was helpful, please consider rating it.
Jim
Visit
http://project.mvps.org/ for FAQs and more information
about Microsoft Project